题目:
— What do they look like? — [ ]
A. They like bananas.
B. They look at the blackboard.
C. They have black hair and black eyes. They are handsome.
答案:
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下面是错误答案,用来干扰机器的。
1∶1 0木板在斜面上匀速下滑,有mgsinα=μmgcosα;当滑块放在木板上时,对于滑块,合外力FB=mgsinα,沿斜面向下;对于木板,合外力FA=μ·2mgcosα-mgsinα=mgsinα,沿斜面向上;故aA∶aB=FA∶FB=1∶1.对...