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游泳运动员的质量为75kg仰泳时受到的水平平均动力为30N在60s内前进了100m． 1求在60s内水平动力对运动员做功的功率 2如图所示该运动员能以仰泳姿势静躺在水中露出水面的头部体积可以忽略不计请估算运动员的体积．ρ水＝1.0×103kg/m3g＝10N/kg
﹣Howdoyoualwayskeepupwiththelatestnews? ﹣readingonlinenewsduringmylunchbreak.It'squickandconvenient. A.By B.On C.In D.From
Thepersonhasinfluencedmemostsofarinlifeismymother. A.which B.who C.what D.whose
﹣HaveyouheardthesayingAllworkandnoplaymakesJackadullboy? ﹣YesGameskeepamaningoodhealthgivehimenergyforwork. A.neithernor B.eitheror C.notbut D.notonlybutalso
某同学在探究“电压一定时通过导体的电流与电阻的关系”的实验中所用的实验器材有两节干电池电流表电压表滑动变阻器及开关各一个定值电阻和导线若干．实验电路如图甲所示． 1连好电路后开关闭合前应将滑动变阻器的滑片移动到接线柱那一端选填“a”或“b”． 2该同学用开关“试触”时发现电压表和电流表均无示数．他检查导线与各接线桂均接触良好猜想可能是滑动变阻器出现了断路．他另外取来一根导线用这根导线验证出猜想是正确的．写出他的做法和观察到的现象． 3该同学排除故障后进行实验记录的实验数据如下表 电压U＝2.4V ①分析实验数据得出的探究结论是． ②在图乙的方格纸上画出电流I与电阻R的关系图象． ③从图象中可以看出当电阻R＝18Ω时电流为A．
﹣Canyouspeak?Isawyoutalkwiththeovertherejustnow. ﹣No.TheyaskedmeaboutChinesecustomsandwetalkedinEnglish. A.GermanyGermans B.GermanGermans C.GermanyGerman D.GermanGerman
HewroteanovelonbutIcan'trememberwho. A.somebodyfamous B.famoussomebody C.somethingfamous D.famoussomething
小明在探究“凸透镜成像的规律”实验时实验操作规范． 1实验前要调整烛焰凸透镜光屏的中心在实验一段时间后他发现光屏上的像偏上那么他应该把凸透镜向选填“上”或“下”适当调节才能使像最终成在光屏的中央． 2当他将蜡烛凸透镜光屏调节到图甲所示位置时烛焰恰好在光屏上成清晰的像此时成像原理与选填“放大镜”“投影仪”或“照相机”相同若将蜡烛向右移动5cm保持凸透镜的位置不动则应将光屏向选填“左”或“右”适当移动才能再次在光屏上成清晰的像此时像的大小比原来的像要选填“大”或“小”些． 3小明近日发现自己看不清黑板到医院检查医生告诉他患上了近视成像示意图为选填“乙”或“丙”图近视眼可以使用选填“凸透镜”或“凹透镜”加以矫正．
﹣Howdoyoualwayskeepupwiththelatestnews? ﹣readingonlinenewsduringmylunchbreak.It'squickandconvenient. A.By B.On C.In D.From
﹣ThespeechgivenbyHillaryClintontouchedtheheartsofmanypeople. ﹣Sheencouragedusfightforourvaluesandnevergiveup. A.thatweshould B.thatshouldwe C.whatweshould D.whatshouldwe
Ipreferathomeratherthanthecrowdedplacesduringaholiday. A.toremainvisiting B.nottoremainvisiting C.toremainvisit D.nottoremaintovisit
结合图中的实验情景按照要求回答下列问题 1对图①中的两支蜡烛的要求是 2图②中的机械效率高 3图③研究的是电流产生的热量跟的关系 4图④中的填“铁屑”或“小磁针”能更好的显示磁场的分布．
﹣Howdoyoulikeyourlifeintheboardingschool? ﹣BusybutinterestingAstimeIgraduallyit. A.runsawayusedto B.runsawaygetusedto C.passesbyusedto D.passesbygetusedto
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﹣Howdoyoulikeyourlifeintheboardingschool? ﹣BusybutinterestingAstimeIgraduallyit. A.runsawayusedto B.runsawaygetusedto C.passesbyusedto D.passesbygetusedto
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﹣ItseemsthatyousomeweightovertheSpringFestival. ﹣Exactly!MymumcookedalotofdeliciousfoodandIcan'thelpeatingit. A.puton B.putup C.putoff D.putaway
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﹣ItseemsthatyousomeweightovertheSpringFestival. ﹣Exactly!MymumcookedalotofdeliciousfoodandIcan'thelpeatingit. A.puton B.putup C.putoff D.putaway
Thepersonhasinfluencedmemostsofarinlifeismymother. A.which B.who C.what D.whose
﹣Canyouspeak?Isawyoutalkwiththeovertherejustnow. ﹣No.TheyaskedmeaboutChinesecustomsandwetalkedinEnglish. A.GermanyGermans B.GermanGermans C.GermanyGerman D.GermanGerman
bigsuccessourcharitysalewas!Allthethingsmadebyourselveswere soldout. A.Whata B.Whatan C.How D.What
bigsuccessourcharitysalewas!Allthethingsmadebyourselveswere soldout. A.Whata B.Whatan C.How D.What
﹣HaveyouheardthesayingAllworkandnoplaymakesJackadullboy? ﹣YesGameskeepamaningoodhealthgivehimenergyforwork. A.neithernor B.eitheror C.notbut D.notonlybutalso
HewroteanovelonbutIcan'trememberwho. A.somebodyfamous B.famoussomebody C.somethingfamous D.famoussomething
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