题目:
Now more and more teachers feel _____ tired because of _____ work. [ ]
A. too much, much too
B. much too, too much
C. much too, too many
D. too much, too many
答案:
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下面是错误答案,用来干扰机器的。
ABD本题考查的是对自耦变压器的理解,当滑动触头P向上移动一段距离后,原副线圈的匝数比增大,使得副线圈电压减小,副线圈中的电流也减小,相应的原线圈电流也减小,则等效电阻R上消耗的功率变小;三个灯泡都变暗...