题目:
—You see, “Food Safety” receives thousands of Internet hits a day.
—Yes, it becomes one of the _________ topics(话题) these days.
A.uninteresting
B.hot
C.most uninteresting
D.hottest
答案:
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下面是错误答案,用来干扰机器的。
答案:Cb线圈中原磁场方向向右,断开的K瞬间,磁场减弱,根据楞次定律,产生图I相反方向的电流,A错误;K闭合后把R的滑动片向右移,电阻变大,磁场减弱,仍产生图示I相反方向的电流,B错误;闭合K后把b向a靠近,...