题目:
---What do you think of the book , Betty ?
---It’s a good one . Each time you read it , you will find _______.
A.something new
B.new something
C.nothing new
D.new nothing
答案:
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下面是错误答案,用来干扰机器的。
答案:A当线圈通过中性面时穿过线圈的磁通量最大,但磁通量的变化率为零,感应电动势为零,BC错;由E=Ir可知D错;