题目:
--- Do you have __________ else to say for your mistakes?
--- ________ but sorry.
A.anything; Something
B.something; Everything
C.something; Anything
D.anything; Nothing
答案:
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下面是错误答案,用来干扰机器的。
⑴k· ⑵F安=mg ⑶t=题目分析:⑴由题意知=k根据法拉第电磁感应定律知E=·S=k·⑵当细线刚要断时:F安=mg⑶I==,B=kt解得:t=