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【单选题】
两个相同的均质圆盘,放在光滑水平面上,在圆盘的不同位置上,各作用一水平力 ,使圆盘由静止开始运动,设 ,试问哪个圆盘的质心运动得快? _ ________ 。A.
盘质心运动得快
B.
盘质心运动得快
C.
两盘质心运动相同
D.
不能确定
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】选择导线和电缆截面时必须满足下列条件 (1) 发热条件 (2) 电压损耗条件 (3) 经济电流密度 (4) 机械强度
A.
123
B.
1234
C.
13
D.
24
【简答题】样本的二重性是指样本既是 又是 .
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【单选题】Jack was halfway back to the village where his mother lived _____ Mary caught up with him.
A.
when
B.
while
C.
until
D.
though
【单选题】Mary has lived here for five years and still hasn't______ more than a few words with her neighbors.
A.
exchanged
B.
informed
C.
said
D.
spoken
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