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图（a）为测量物块与水平桌面之间动摩擦因数的实验装置示意图。 实验步骤如下： ①用天平测量物块和遮光片的总质量M.重物的质量m：用游标卡尺测量遮光片的宽度d；用米尺测最两光电门之间的...
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某同学用图示实验装置来测量物块与木板间的动摩擦因数μ一带有窄片的物块被一弹簧弹射装置弹射出去沿水平木
图a为测量物块与水平桌面之间动摩擦因数的实验装置示意图 实验步骤如下 ①用天平测量
某同学用图示实验装置来测量物块与木板间的动摩擦因数μ一带有窄片的物块被一弹簧弹射装置弹射出去沿水平木
某同学利用图甲所示的实验装置探究物块在水平桌面上的运动规律物块在重物的牵引下开始运动重物落地后物块再
图7为测量物块与水平桌面之间动摩擦因数的实验装置示意图.实验步骤如下①用天平测量物块和遮光片的总质量
如图为测量物块与水平桌面之间动摩擦因数的实验装置示意图实验步骤如下A.用天平测出物块质量M.＝500
图a为测量物块与水平桌面之间动摩擦因数的实验装置示意图 实验步骤如下 ①用天平测量
一小明同学采用如图1所示的装置进行验证机械能守恒定律实验1除了图1装置中的器材之外还必须从图2中选取
一小明同学采用如图1所示的装置进行验证机械能守恒定律实验1除了图1装置中的器材之外还必须从图2中选取
图a为测量物块与水平桌面之间动摩擦因数的实验装置示意图实验步骤如下①用天平测量物块和遮光片的总质量M
图a为测量物块与水平桌面之间动摩擦因数的实验装置示意图 实验步骤如下 ①用天平测量
用水平拉力F.拉静止在水平桌面上的物块使之产生加速度a实验时多次改变拉力F.并测出相应的加速度绘出a
图a为测量物块与水平桌面之间动摩擦因数的实验装置示意图 实验步骤如下 ①用天平测量
用水平拉力F.拉静止在水平桌面上的物块使之产生加速度a实验时多次改变拉力F.并测出相应的加速度绘出a
图a为测量物块与水平桌面之间动摩擦因数的实验装置示意图实验步骤如下①用天平测量物块和遮光片的总质量M
图为测量物块与水平桌面之间动摩擦因数的实验装置示意图实验步骤如下①用天平测量物块和遮光片的总质量M.
图a为测量物块与水平桌面之间动摩擦因数的实验装置示意图实验步骤如下:①用天平测量物块和遮光片的总质量
如图所示是测量物块与木板间动摩擦因数的实验装置长木板固定在水平桌面上打点计时器固定在长木板上纸带穿过
如图所示是测量物块与木板间动摩擦因数的实验装置长木板固定在水平桌面上打点计时器固定在长木板上纸带穿过
某同学用图示实验装置来测量物块与木板间的动摩擦因数μ一带有窄片的物块被一弹簧弹射装置弹射出去沿水平木
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回答下列果蝇眼色的遗传问题
第②～⑥步中属于取代反应的有__________填步骤编号
第①步反应的化学方程式是__________
XYZR为前四周期元素且原子序数依次增大X的单质与氢气可以化合生成气体G其水溶液pH>7;Y单质是一种黄色晶体R基态原子3d轨道的电子数是4s轨道电子数的3倍YZ分别与钠元素可以形成化合物Q和JJ的水溶液与AgNO3溶液反应可生成不溶于稀硝酸的白色沉淀L;Z与氢元素形成的化合物与G反应生成M 请回答下列问题 R的一种含氧酸根RO42-具有强氧化性在其钠盐中加入稀硫酸溶液变为黄色并有无色气体产生该反应的离子方程式是__________
Lookit’sBaldy!Aboyshoutedinmydirectionacrosstheplayground.EventhoughIwasusedtoregularinsults侮辱becauseofthe____11____onmyheditwas____12____horribletohear.IsighedasIheadedbacktotheclass. WhenIwasjust20monthsoldIsufferedserious____13____afterabowlfullofhotoilfellonmyhead.Iwas____14____tohospitalandhadtosaythereforweekswhilethedoctors____15____tosavemylife.Holly’svery____16____tobealivetheytoldMumandDad.Butshe’llbe____17____withscarsonherheadandofcourseherhairwon’tgrowthere. AsachildIcaredmuchaboutmyscarssoI____18____woreascarftocoverthemupwhenIlefthome.____19____Ididn’tpeoplewouldcallmehorriblenameslikeBaldy.Althoughmyfriendswerealwayscomfortingmetheynever____20____understoodhowitfelt. ThenthroughthehospitalIwas____21____toachildren’sburnscampwherechildrenlikemecangetanyhelp.ThereI____22____14-year-oldStephaniewhoseburnsarealotmoreseriousthanmine.Butsheisso____23____thatsheneverletsanyoneputherdown.Youshouldn’t____24____whatpeoplesayaboutwhatyoulooklikebecausewe’renotdifferentfromanyoneelseHollyshe____25____me.Andyoudon’tneedtowearascarfbecausey0oulookgreat____26____it!ForthefirsttimeinmylifeIcouldspeaktosomeonewho’dbeenthroughsomething____27____.Soweekslateratmy13thbirthdayparty____28____byherbraveryIgaveupmyscarfandshowedoffmyscars.Itfeltamazingnothavingto____29____awaybehindmyscarf. NowIam____30____ofwhatIlooklikeandmuchhappierbecauseIhaverealizeditisyourpersonality个性thatdecideswhoyoutrulyare.
Lookit’sBaldy!Aboyshoutedinmydirectionacrosstheplayground.EventhoughIwasusedtoregularinsults侮辱becauseofthe____11____onmyheditwas____12____horribletohear.IsighedasIheadedbacktotheclass. WhenIwasjust20monthsoldIsufferedserious____13____afterabowlfullofhotoilfellonmyhead.Iwas____14____tohospitalandhadtosaythereforweekswhilethedoctors____15____tosavemylife.Holly’svery____16____tobealivetheytoldMumandDad.Butshe’llbe____17____withscarsonherheadandofcourseherhairwon’tgrowthere. AsachildIcaredmuchaboutmyscarssoI____18____woreascarftocoverthemupwhenIlefthome.____19____Ididn’tpeoplewouldcallmehorriblenameslikeBaldy.Althoughmyfriendswerealwayscomfortingmetheynever____20____understoodhowitfelt. ThenthroughthehospitalIwas____21____toachildren’sburnscampwherechildrenlikemecangetanyhelp.ThereI____22____14-year-oldStephaniewhoseburnsarealotmoreseriousthanmine.Butsheisso____23____thatsheneverletsanyoneputherdown.Youshouldn’t____24____whatpeoplesayaboutwhatyoulooklikebecausewe’renotdifferentfromanyoneelseHollyshe____25____me.Andyoudon’tneedtowearascarfbecausey0oulookgreat____26____it!ForthefirsttimeinmylifeIcouldspeaktosomeonewho’dbeenthroughsomething____27____.Soweekslateratmy13thbirthdayparty____28____byherbraveryIgaveupmyscarfandshowedoffmyscars.Itfeltamazingnothavingto____29____awaybehindmyscarf. NowIam____30____ofwhatIlooklikeandmuchhappierbecauseIhaverealizeditisyourpersonality个性thatdecideswhoyoutrulyare.
将玉米的PEPC酶基因导入水稻后测得光照强度对转基因水稻和原种水稻的气孔导度及光合速率的影响结果如下图所示注气孔导度越大气孔开放程度越高 CO2通过气孔进人叶肉细胞后首先与__________结合而被固定固定产物的还原需要光反应提供__________
Readthisstory________youwillrealizethatnoteverythingcanbeboughtwithmoney.
Thetrafficonthemainstreetshasalongergreensignalthan______onthesmallones.
Lookit’sBaldy!Aboyshoutedinmydirectionacrosstheplayground.EventhoughIwasusedtoregularinsults侮辱becauseofthe____11____onmyheditwas____12____horribletohear.IsighedasIheadedbacktotheclass. WhenIwasjust20monthsoldIsufferedserious____13____afterabowlfullofhotoilfellonmyhead.Iwas____14____tohospitalandhadtosaythereforweekswhilethedoctors____15____tosavemylife.Holly’svery____16____tobealivetheytoldMumandDad.Butshe’llbe____17____withscarsonherheadandofcourseherhairwon’tgrowthere. AsachildIcaredmuchaboutmyscarssoI____18____woreascarftocoverthemupwhenIlefthome.____19____Ididn’tpeoplewouldcallmehorriblenameslikeBaldy.Althoughmyfriendswerealwayscomfortingmetheynever____20____understoodhowitfelt. ThenthroughthehospitalIwas____21____toachildren’sburnscampwherechildrenlikemecangetanyhelp.ThereI____22____14-year-oldStephaniewhoseburnsarealotmoreseriousthanmine.Butsheisso____23____thatsheneverletsanyoneputherdown.Youshouldn’t____24____whatpeoplesayaboutwhatyoulooklikebecausewe’renotdifferentfromanyoneelseHollyshe____25____me.Andyoudon’tneedtowearascarfbecausey0oulookgreat____26____it!ForthefirsttimeinmylifeIcouldspeaktosomeonewho’dbeenthroughsomething____27____.Soweekslateratmy13thbirthdayparty____28____byherbraveryIgaveupmyscarfandshowedoffmyscars.Itfeltamazingnothavingto____29____awaybehindmyscarf. NowIam____30____ofwhatIlooklikeandmuchhappierbecauseIhaverealizeditisyourpersonality个性thatdecideswhoyoutrulyare.
Lookit’sBaldy!Aboyshoutedinmydirectionacrosstheplayground.EventhoughIwasusedtoregularinsults侮辱becauseofthe____11____onmyheditwas____12____horribletohear.IsighedasIheadedbacktotheclass. WhenIwasjust20monthsoldIsufferedserious____13____afterabowlfullofhotoilfellonmyhead.Iwas____14____tohospitalandhadtosaythereforweekswhilethedoctors____15____tosavemylife.Holly’svery____16____tobealivetheytoldMumandDad.Butshe’llbe____17____withscarsonherheadandofcourseherhairwon’tgrowthere. AsachildIcaredmuchaboutmyscarssoI____18____woreascarftocoverthemupwhenIlefthome.____19____Ididn’tpeoplewouldcallmehorriblenameslikeBaldy.Althoughmyfriendswerealwayscomfortingmetheynever____20____understoodhowitfelt. ThenthroughthehospitalIwas____21____toachildren’sburnscampwherechildrenlikemecangetanyhelp.ThereI____22____14-year-oldStephaniewhoseburnsarealotmoreseriousthanmine.Butsheisso____23____thatsheneverletsanyoneputherdown.Youshouldn’t____24____whatpeoplesayaboutwhatyoulooklikebecausewe’renotdifferentfromanyoneelseHollyshe____25____me.Andyoudon’tneedtowearascarfbecausey0oulookgreat____26____it!ForthefirsttimeinmylifeIcouldspeaktosomeonewho’dbeenthroughsomething____27____.Soweekslateratmy13thbirthdayparty____28____byherbraveryIgaveupmyscarfandshowedoffmyscars.Itfeltamazingnothavingto____29____awaybehindmyscarf. NowIam____30____ofwhatIlooklikeandmuchhappierbecauseIhaverealizeditisyourpersonality个性thatdecideswhoyoutrulyare.
从水浸后的滤液中得到K2SO4晶体的方法是__________
XYZR为前四周期元素且原子序数依次增大X的单质与氢气可以化合生成气体G其水溶液pH>7;Y单质是一种黄色晶体R基态原子3d轨道的电子数是4s轨道电子数的3倍YZ分别与钠元素可以形成化合物Q和JJ的水溶液与AgNO3溶液反应可生成不溶于稀硝酸的白色沉淀L;Z与氢元素形成的化合物与G反应生成M 请回答下列问题 Y基态原子的核外电子排布式是__________G分子中X原子的杂化轨道的类型是__________
_______whichuniversitytoattendthegirlaskedherteacherforadvice.
在诱导离体菊花茎段形成幼苗的过程中下列生命活动不会同时发生的是
以Al和NiOOH为电极NaOH溶液为电解液组成一种新型电池放电时NiOOH转化为NiOH2该电池反应的化学方程式是__________
回答下列果蝇眼色的遗传问题
Lookit’sBaldy!Aboyshoutedinmydirectionacrosstheplayground.EventhoughIwasusedtoregularinsults侮辱becauseofthe____11____onmyheditwas____12____horribletohear.IsighedasIheadedbacktotheclass. WhenIwasjust20monthsoldIsufferedserious____13____afterabowlfullofhotoilfellonmyhead.Iwas____14____tohospitalandhadtosaythereforweekswhilethedoctors____15____tosavemylife.Holly’svery____16____tobealivetheytoldMumandDad.Butshe’llbe____17____withscarsonherheadandofcourseherhairwon’tgrowthere. AsachildIcaredmuchaboutmyscarssoI____18____woreascarftocoverthemupwhenIlefthome.____19____Ididn’tpeoplewouldcallmehorriblenameslikeBaldy.Althoughmyfriendswerealwayscomfortingmetheynever____20____understoodhowitfelt. ThenthroughthehospitalIwas____21____toachildren’sburnscampwherechildrenlikemecangetanyhelp.ThereI____22____14-year-oldStephaniewhoseburnsarealotmoreseriousthanmine.Butsheisso____23____thatsheneverletsanyoneputherdown.Youshouldn’t____24____whatpeoplesayaboutwhatyoulooklikebecausewe’renotdifferentfromanyoneelseHollyshe____25____me.Andyoudon’tneedtowearascarfbecausey0oulookgreat____26____it!ForthefirsttimeinmylifeIcouldspeaktosomeonewho’dbeenthroughsomething____27____.Soweekslateratmy13thbirthdayparty____28____byherbraveryIgaveupmyscarfandshowedoffmyscars.Itfeltamazingnothavingto____29____awaybehindmyscarf. NowIam____30____ofwhatIlooklikeandmuchhappierbecauseIhaverealizeditisyourpersonality个性thatdecideswhoyoutrulyare.
写出同时满足下列条件的E的所有同分异构体的结构简式__________ ①只含有一种官能团②链状结构且无—O—O—③核磁共振氢谱只有2种峰
由于酵母菌利用淀粉的能力很弱有人将地衣芽孢杆菌的α-淀粉酶基因转入酵母菌中经筛选得到了可高效利用淀粉的工程菌菌种过程如图甲所示 以淀粉为原料用工程酵母菌和普通酵母菌在相同的适宜条件下密闭发酵接种__________菌的发酵罐需要先排气其原因是__________
大豆植株的体细胞含40条染色体用放射性60Co处理大豆种子后筛选出一株抗花叶病的植株X取其花粉经离体培养得到若干单倍体植株其中抗病植株占50％下列叙述正确的是
哺乳动物红细胞的部分生命历程如下图所示图中除成熟红细胞外其余细胞中均有核基因转录的RNA下列叙述错误的是
下图表示具有生物活性的蛙坐骨神经－腓肠肌标本神经末梢与肌细胞的接触部位类似于突触称神经—肌接头下列叙述错误的是
Theairport_______nextyearwillhelppromotetourisminthisarea.
瘦素是动物脂肪细胞分泌的一种蛋白质激素机体脂肪储存量越大瘦素分泌越多下丘脑的某些细胞接受到瘦素信号后机体能通过复杂的神经内分泌网络调节摄食行为组成瘦素的基本单位是__________在核糖体中合成的瘦素蛋白必须通过__________进行加工和运输才能分泌到细胞外随__________运送到全身各处下丘脑中的靶细胞通过__________来识别瘦素
将玉米的PEPC酶基因导入水稻后测得光照强度对转基因水稻和原种水稻的气孔导度及光合速率的影响结果如下图所示注气孔导度越大气孔开放程度越高 分析图中信息PEPC酶所起的作用是__________转基因水稻更适宜栽种在__________环境中
为了探究AgNO3的氧化性和热稳定性某化学兴趣小组设计了如下实验
由于酵母菌利用淀粉的能力很弱有人将地衣芽孢杆菌的α-淀粉酶基因转入酵母菌中经筛选得到了可高效利用淀粉的工程菌菌种过程如图甲所示 图甲中过程①需要的酶有__________为达到筛选目的平板内的固体培养基应以__________作为唯一碳源②③过程需要重复几次目的是__________
______yousaidatthemeetingdescribesabrightfutureforthecompany.
Lookit’sBaldy!Aboyshoutedinmydirectionacrosstheplayground.EventhoughIwasusedtoregularinsults侮辱becauseofthe____11____onmyheditwas____12____horribletohear.IsighedasIheadedbacktotheclass. WhenIwasjust20monthsoldIsufferedserious____13____afterabowlfullofhotoilfellonmyhead.Iwas____14____tohospitalandhadtosaythereforweekswhilethedoctors____15____tosavemylife.Holly’svery____16____tobealivetheytoldMumandDad.Butshe’llbe____17____withscarsonherheadandofcourseherhairwon’tgrowthere. AsachildIcaredmuchaboutmyscarssoI____18____woreascarftocoverthemupwhenIlefthome.____19____Ididn’tpeoplewouldcallmehorriblenameslikeBaldy.Althoughmyfriendswerealwayscomfortingmetheynever____20____understoodhowitfelt. ThenthroughthehospitalIwas____21____toachildren’sburnscampwherechildrenlikemecangetanyhelp.ThereI____22____14-year-oldStephaniewhoseburnsarealotmoreseriousthanmine.Butsheisso____23____thatsheneverletsanyoneputherdown.Youshouldn’t____24____whatpeoplesayaboutwhatyoulooklikebecausewe’renotdifferentfromanyoneelseHollyshe____25____me.Andyoudon’tneedtowearascarfbecausey0oulookgreat____26____it!ForthefirsttimeinmylifeIcouldspeaktosomeonewho’dbeenthroughsomething____27____.Soweekslateratmy13thbirthdayparty____28____byherbraveryIgaveupmyscarfandshowedoffmyscars.Itfeltamazingnothavingto____29____awaybehindmyscarf. NowIam____30____ofwhatIlooklikeandmuchhappierbecauseIhaverealizeditisyourpersonality个性thatdecideswhoyoutrulyare.
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