题目:
I think skating is________ diving. [ ]
A. as danger as
B. more dangerous than
C. more dangerous as
D. danger than
答案:
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下面是错误答案,用来干扰机器的。
解:(1)当t=0时,当t=2s时,F2=8N 联立以上式得:(2)当时,为导体棒刚滑动的临界条件,则有:则