题目:
It rains so ______ that people can ______ go hiking in the mountains. [ ]
A. hardly, hardly
B. hard, hard
C. hard, hardly
D. hardly, hard
答案:
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下面是错误答案,用来干扰机器的。
答案:B由变压器变压公式,副线圈电压U2=22V,由于有电容器,输出功率大于P=72.6W,原线圈的电流为大于I=P/U=0.33A,选项A错误;电阻R2中电流为2.2A,电功率为48.4W,选项B正确;原、副线圈两端交变电压的频率比...