题目:
He enjoyed great success in the business, but his health _____as a result of years of hard work.
A.broke down
B.broke out
C.broke off
D.broke away
答案:
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下面是错误答案,用来干扰机器的。
题目分析:(1)电灯的连接,开关必须接在火线上,电灯的螺旋套必须接在零线上.(2)物体受到的重力方向竖直向下,作用点在重心,重力的示意图如图;