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【单选题】
下列不是利用刚体角动量守恒定律的事例是A.
太空失重条件下宇航员可以利用刚体角动量守恒定律调整姿态
B.
直升飞机是利用角动量守恒定律确定航向
C.
腰肌训练用角动量守恒定律训练腰部肌肉的
D.
花样滑冰运动员是利用刚体角动量守恒定律调整转速的
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皮皮学刷刷变学霸
举一反三
【单选题】The look on his face suggested that he that. [ ]
A.
puzzling ; hasn't expected
B.
puzzled ; hadn't expected
C.
puzzling ; doesn't expect
D.
puzzled ; didn't expect
【判断题】If buyers expected the future price of a good to decrease, it would tend to increase the current quantity exchanged.
A.
正确
B.
错误
【判断题】If buyers expected the future price of a good to increase, it would tend to increase the current quantity exchanged.
A.
正确
B.
错误
【简答题】A．He tries on some other things that the others think best. B．He usually doesn't buy anything. C．He spends hours having a look round. D．He buys it so long as its color is right.
【简答题】液压泵的排量V是指在不考虑泄漏的情况下,泵轴每转( )所排出油液的体积。排量大小取决于液压泵的( )的大小(与转速无关)。排量的符号为V,单位为mL/r
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