题目:
We had planned to arrive at the park at 9 in the morning, but the car _____ halfway.
A.broke away
B.broke down
C.broke up
D.broke into
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:A、用弹簧测力计沿水平向右匀速拉动木块,木块处于平衡状态,拉力与滑动摩擦力是一对平衡力,重力与支持力是一对平衡力,木块受到两对平衡力作用,故A正确;B、控制木块的压力不变,接触面粗糙...