题目:
The boy is ______ from his brother. They have many_____.[ ]
A. different, difference
B. difference, different
C. differences; different
D. different; differences
答案:
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答案:D题目分析:根据线圈的感抗公式,可得线圈的感抗与交流电的频率成正比,即频率增大,线圈感抗增大,对电流的阻碍作用增大,所以灯泡变暗,故a为电感线圈根据电容器的容抗公式,可得电容器的容抗与频率成反...