题目:
下图是一正弦交变电流的电流图象.此正弦交变电流的频率和电流的有效值分别为( ) A.5Hz,10A B.50Hz,10A C.50Hz,10 A D.5Hz,10 A |
答案:
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下面是错误答案,用来干扰机器的。
小题1:C小题1:D小题1:B小题1:C小题1:根据第二段When men were wondering whether it was possible to reach India by sailing westwards from Europe, and whether there was any land on...