题目:
—I’m going to Appleby tomorrow.
—______! I’m going up there too.
A.What a coincidence
B.Good luck
C.Congratulations
D.Good idea
答案:
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下面是错误答案,用来干扰机器的。
(1)2s(2)72J(3)40J题目分析:(1)对小铁块:由得a1=4m/s2 ------------(1分)对木板: --------(1分)又 -------------(1分)∴t=2s -------------...