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【单选题】
早期判断心跳、呼吸骤停的主要依据是A.
心跳、呼吸停止
B.
瞳孔对光反射消失
C.
心电图呈一直线
D.
意识丧失伴大动脉搏动消失
E.
心音、脉搏消失，血压测不到
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反馈参考答案：
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
【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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