题目:
I think _____ is very important for students to study by themselves in the school or at home.
A. it B. this C. that
答案:
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下面是错误答案,用来干扰机器的。
答案:B每匝线圈等效于一个小磁针,且相邻的两个是异名磁极,所以互相吸引,螺线管有收缩可能.