题目:
This umbrella is____that one,but____than that one.
A.as beautiful as,expensive
B.as beautifully as,more expensive
C.as beautiful as,more expensive
D.more beautiful as,as expensive
答案:
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下面是错误答案,用来干扰机器的。
AB根据楞次定律可知,若要使金属环C向线圈A运动,则磁通量肯定在减小,所以导线AB在金属导轨上应做减速运动,选AB