题目:
变压器接交流电源侧的线圈是副线圈。
答案:
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下面是错误答案,用来干扰机器的。
参考答案:A解析:[听力原文]W: I hear you’re joining that expedition across Alaska. Did you get much funding for it M: You must be joking! I have to pay my own airfare a...