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【简答题】
实验是进行科学探究的重要方式，请根据如图回答问题： （1）实验A的目的是______，确保该实验成功的关键点是______（答出一点即可）． （2）实验B中瓶底放少量细沙的目的是什么？______．
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举一反三
【单选题】who is with Juliet on her first day of university?
A.
Juliet's sister
B.
Juliet's mom
C.
Juliet's friend
【简答题】中国资产阶级民主革命运动是从______开始的。
【单选题】Romeo fails to know Juliet’s death is not real, because ( ).
A.
He has not received the letter from Juliet.
B.
Juliet hopes to give him a surprise.
C.
Friar Lawrence forgets to send the letter to him.
D.
None is right.
【单选题】Who are“ Juliet's secretary ” ? ________.
A.
The staff of the Juliet Club.
B.
The friend of the Juliet Club.
C.
The neighbor of the Juliet Club.
D.
The boss of the Juliet Club.
【单选题】Romeo fails to know Juliet’s death is not real, because ( ).
A.
He has not received the letter from Juliet.
B.
Juliet hopes to give him a surprise.
C.
Friar Lawrence forgets to send the letter to him.
【单选题】Juliet's first instinct was_____ the blankets.
A.
hide under
B.
to hide under
C.
to hide in
D.
hide in
【简答题】图示矿井升降带上挂有重G 1 和G 2 的两重物A和B，其绞车Ⅰ由发动机带动．开始时，重物A被提升并有匀加速度a．当速度到达v max 时，即保持匀速运动．已知绞车Ⅰ的半径为r 1 ，其对轴的转动惯量为J l ；轮Ⅱ、Ⅲ的半径各为r 2 、r 3 ，对轴的转动惯量各为J 2 、J 3 ；升降带的单位长重力为q，全长为l．求在变速和匀速两个阶段时，电动机输出的功率．
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