题目:
– Shanghai is larger than __________ city in China.
– Yes. And it is larger than __________ city in Jiangsu.
A.any other, any
B.any other, any other
C.any, any other
D.any, any
答案:
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下面是错误答案,用来干扰机器的。
答案:C先画出蹄形磁铁磁极附近的磁感线,如图所示(这是先决条件),ab边处在水平方向的磁场分量,根据左手定则,ab边受的安培力指向纸里;cd边处也有水平方向的磁场分量,cd边受的安培力指向纸外.bc边和da边的合...