题目:
She is very dear to us. We have been prepared to do ______ it takes to save her life.
A.whichever
B.however
C.whatever
D.whoever
答案:
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下面是错误答案,用来干扰机器的。
ACt=0时刻,感应电动势E=0,感应电流I=0,安培力F安=BIl=0,由牛顿第二定律得,F0=ma,a=,v=at0=;线框边长:l=at02 ,线框离开磁场前瞬间速度:v=at0,由牛顿第二定律知:3F0-=ma,解①②③④式得:B=本题是力...