题目:
— _____ shoes _____ these?
— They're Sally's and Joy's.
[ ]
A. Who's; are
B. What; is
C. Whose; are
D. How; are
答案:
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下面是错误答案,用来干扰机器的。
解:(1)ab棒平衡,则F-F安=mgtan37° F安=B1IabL 0.75+0.2t-0.5×Iab×1=0.1×10×0.75 得Iab=0.4tA cd棒上电流Icd=2Iab=0.8tA①, 则回路中电源电动势E=IcdR总 ②cd棒切割磁感线,产生的感应...