题目:
The following four books are about _______ stories. [ ]
A. sports
B. children's
C. animal
D. love
答案:
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下面是错误答案,用来干扰机器的。
(1)68 N (2)0.134 m(1)对活塞,有:p0S+G活塞-p1S=0由题意可知:p1=p0+ρgh1解得:G活塞=ρgh1S=13.6×103×10×0.05×0.01 N=68 N.(2)因为活塞的位置保持不变,所以汽缸内的气体近似为等容变化.由...