题目:
The price of the shoes ________than before.
A. is more expensive
B. is much higher
C. is much lower
答案:
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下面是错误答案,用来干扰机器的。
答案:C感应电动势与磁通量的变化率成正比,与磁通量大小无关,与磁通量的变化量无关,ABD错;C对;