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一次函数y＝2x+1的图象不经过第（ ）象限．
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若一次函数y1＝kx－b的图象经过第一三四象限则一次函数y2＝bx+k的图象经过第象限.
如果一次函数y＝kx＋2经过点11那么这个一次函数
y随x的增大而增大
y随x的增大而减小
图象经过原点
图象不经过第二象限
一次函数y=6x＋1的图象不经过第象限.
一次函数y＝-2x-1的图象不经过
第一象限
第二象限
第三象限
第四象限
已知一次函数y＝kx＋bk≠0的图象经过2－1－34两点则它的图象不经过第______象限.
在一次函数y=kx+2中若y随x的增大而增大则它的图象不经过第象限.
一次函数y=﹣2x+1的图象一定不经过第__________象限.
在一次函数y＝kx＋2中若y随x的增大而增大则它的图象不经过第____象限.
一次函数y=﹣2x﹣1的图象不经过
第一象限
第二象限
第三象限
第四象限
一次函数y=﹣2x﹣1的图象不经过
第一象限
第二象限
第三象限
第四象限
如果一次函数y=k-1x+b-2的函数图象不经过第一象限则k的范围是_________b的范围是__
一次函数y＝ax＋b满足ab＞0且y随x的增大而减小则此图象一定不经过第象限.
一次函数y=-2x-1的图象不经过
第一象限
第二象限
第三象限
第四象限
二次函数y＝－x2＋bx＋c的图象如图226则一次函数y＝bx＋c的图象不经过第_________
一次函数y＝kx＋bk≠0的图象经过A.10和B.02两点则它的图象不经过第________象限.
在一次函数y=kx+2中若y随x的增大而增大则它的图象不经过第象限.
一次函数y=﹣2x+2的图象不经过第象限.
一
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一次函数y=﹣2x+1的图象不经过
第一象限
第二象限
第三象限
第四象限
一次函数y=kx+b满足kb>0且ｙ随ｘ的增大而减小则此函数的图象不经过第______象限
若一元二次方程x2－2x－m＝0无实数根则一次函数y＝m＋1x＋m－1的图象不经过第____象限.
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1833年Payen和Personz从麦芽的水抽提物中用酒精沉淀得到了一种对热不稳定的物质它可以使淀粉水解为可溶性糖后来知道这种物质就是淀粉酶．淀粉酶有多种类型如α﹣淀粉酶可使淀粉内部随机水解β﹣淀粉酶则使淀粉从末端以两个单糖为单位进行水解．如图为研究pH对两种淀粉酶相对活性影响的研究结果．请据图回答相关的问题 1与α﹣淀粉酶水解淀粉的终产物相比β﹣淀粉酶水解淀粉的主要产物为．从图中可知淀粉酶在人体胃液pH＝l.8左右中的活性更高． 2在验证pH对淀粉酶活性影响的实验中酶的相对活力的大小可以用来表示．某同学设计了以下两种实验方案 ①先分别在试管中加底物再加酶然后一起放在相应的pH条件下保温一段时间后检测． ②先分别在试管中加底物再加在相应的pH条件下保温的酶一段时间后检测． 为了使实验结果更加可靠应选择哪种方案并说明理由．
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假定你是李华从小喜爱大熊猫一直通过有关网站关注几年前在美国动物园出生的大熊猫苏琳和她的母亲白云.现在苏琳即将过生日.请根据以下要点给动物园工作人员写一份信 内容1.自我介绍2.祝贺苏琳生日3.感谢工作人员4.索取苏琳的生日照片. 要求1.只能用5个句子表达全部内容 2.要使用多种时态 3.开头语已经为你写好. DearSir/Madam GreetingsfromChina!
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紫杉醇具有独特的抗肿瘤作用．研究人员从红豆杉中发现了一种具有产紫杉醇能力的内生真菌．为探究制备红豆杉内生真菌原生质体不含细胞壁的适宜pH和温度进行了如下实验①培养菌株离心收集菌丝体并用渗透压稳定剂洗涤两次②将获得的菌丝体分别置于不同pH或温度的培养液中并加入适量酶液震荡摇匀后每隔一段时间取样过滤离心用渗透压稳定剂洗涤两次后收集纯化的原生质体．③统计原生质体数量结果如下． 分析回答 1步骤②中加酶液的目的是洗涤时选用渗透压稳定剂的理由是． 2结果表明制备红豆杉内生真菌原生质体的适宜条件是． 3检验原生质体再生能力需要配制再生固体培养基培养基灭菌后需要冷却到℃左右才能用来倒平板． 4实验中将收集到的原生质体浓度为30×106个/mL培养液先稀释104倍再各取0.1mL稀释液分别均匀涂布在3个再生固体培养基上培养．一段时间后统计得到的菌落数分别为272124．则原生质体再生率能再生的原生质体数占全部原生质体的比例约为．
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三孢布拉霉菌能用来生产胡萝卜素但该菌株的高产性状容易退化需要定期筛选出高产菌株研究表明菌体细胞内含有可将无色的TTC还原为红色复合物的物质且菌体细胞内该物质的含量越高还原能力越强胡萝卜素合成能力也越强．结合下列筛选菌株及提取胡萝卜素的流程图回答问题 三孢布拉霉菌→梯度稀释→涂布到含TTC的培养基上→挑取单菌落→扩大培养→收集菌丝并处理→萃取→鉴定 1胡萝卜素的提取方法有从植物中提取等等．上述流程图中提取到胡萝卜素后鉴定一般要用法．胡萝卜素能够治疗夜盲症干皮症等是因为夜盲症干皮症等疾病是由于缺少维生素A而引起的而1分子的β﹣胡萝卜素可被氧化分解成2分子．根据胡萝卜素的理化性质分析为了让胡萝卜素更容易被人体吸收炒胡萝卜时要多加些． 2流程图中将菌液涂布到含TTC的培养基上目的是筛选出合成胡萝卜素较强的菌体高产菌株含TTC的培养基属于填“选择”或“鉴别”培养基．对照组需涂布等量的以判断培养基是否被污染．挑取单菌落时若菌落周围则菌株合成胡萝卜素的能力较强． 3为了验证萃取物是否是胡萝卜素该同学将叶绿素b叶绿素a叶黄素萃取物和色素混合液含叶绿素b叶绿素a叶黄素和胡萝卜素依次点样在滤纸的12345位置如图甲所示并进行分离滤纸条上各色素带的位置为填字母时即可说明该萃取物最可能是胡萝卜素．
One'sattitudeisalwaysimportant.Ifyouarelazyandweakyouwillnevertastesuccess.Butifyouare1successandhappinesswillbemorelikelytocometoyou. Iloveeatingpersimmons柿子.Butyoucan'tgetthemuntilautumn.Ifyoutrythembeforetherighttimetheyprobably2bad.InGradeSixbecauseofmypoorgradesmyparentswere3thatIwouldn'tbeabletogetintoanexcellentmiddleschool.They4metostudyharderbutIdidn'treallyunderstandwhytheyweresoanxious焦虑的. SummercameandIstudiedhard.ThehotweathermademesleepyandIcouldn'tconcentrate集中精力onmytextbook.ButeverytimewhenIwantedtostop5mydadwouldsayThinkaboutyour6.Ifyoudon'tworkhardyouwillregret.Ihadtositbackdownagainandreturntomytextbooks.ButallI7wasplayingwithmyfriends. Mydadwouldsaytomewithaseriouslookon8faceIfapersimmontreedoesn'tgrowinsummeritcan'tbear结出fruitinautumn!Onlybyworkinghardcanyougetgoodresults.AfewmonthslaterIsucceededin9thekeymiddleschool.Iwassohappy.Mydadwasrightifapersimmontreedoesn'tgrow10summertherewillbenofruitinautumn.IworkedhardandIenjoyedthefruitofmyhardwork! 1.A.busy B.clever C.hard﹣working D.free 2.A.look B.taste C.turn D.smell 3.A.embarrassed B.worried C.excited D.annoyed 4.A.made B.allowed C.pushed D.pulled 5.A.thinking B.working C.playing D.looking 6.A.future B.hobby C.health D.wealth 7.A.talkedabout B.heardabout C.thoughtaboutD.throwabout 8.A.his B.your C.my D.their 9.A.failing B.reaching C.getting D.entering 10.A.before B.during C.after D.until
Thefirefighterscameintimeandquicklythefire.A.putup B.putout C.puton D.putoff
﹣﹣﹣WouldyoupleaseprovideussomeinformationabouttheearthquakeinQinghaiatthebeginningofthisyear?﹣﹣﹣Sure.It'ssaidthatitstartedtheafternoonofJanuary21st.A.for;on B.with;in C.with;on D.for;in
下列与细胞相关的叙述正确的是
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