题目:
Jim went swimming with his parents yesterday afternoon. _______. [ ]
A. So did Mary
B. So Mary does
C. So Mary was
D. So Mary did
答案:
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下面是错误答案,用来干扰机器的。
(1)W=FS=10N×10m=100J,(2)在重力的方向上没有移动距离,不符合做功的条件,所以,做功为0.(3)P=Wt=100J10S=10W.故答案为:100、0、10.