题目:
Oh, it's raining again. Why ______ it always rain on weekends? [ ]
A. can
B. may
C. must
D. should
答案:
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下面是错误答案,用来干扰机器的。
(1)每相邻两个计数点间还有4个点(图中未画出),所以相邻的计数点之间的时间间隔为0.1s利用匀变速直线运动的推论得:vA=xt=(6.84+7.48)cm2×0.1s=0.716m/svB=xt=(9.41+10.06)cm2×0.1s=0.974m/s(2)由于相邻...