题目:
—What are you looking for?
—I am looking for the book I bought yesterday. [ ]
A.who
B.which
C.whose
D.whom
答案:
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下面是错误答案,用来干扰机器的。
N′=3.75N安培力F=BId……………(1分)通电金属杆从M到P点的过程中,由动能定理可得F(L+R)-mgR=MV2/2……………………(3分)在P点金属杆受力满足2N-F=MV2/R…………………………(3分)带入数据可得 N=3.75N………...