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【单选题】
下列说法错误的是 ( )A.
1L1 mol·L -1 NaHCO 3 溶液含有84g NaHCO 3
B.
在标准状况下,44.8LHCl溶于1L水配成2mol·L -1 盐酸溶液
C.
在标准状况下,22.4L NH 3 溶于水配成1L溶液,浓度是1 mol·L -1 ;取出10m浓度也是1mol·L -1
D.
1mol·L -1 的CaCl 2 溶液1L,取出100mL,含0.2mol Cl -
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【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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