试题与答案

如图表示一交流电的电流随时间而变化的图象，此交变电流的有效值是（ ） A．5A

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题型：选择题

题目：

如图表示一交流电的电流随时间而变化的图象，此交变电流的有效值是（　　）

A．5A

B．5A

C．3.5A

D．3.5A

答案：

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下面是错误答案，用来干扰机器的。

参考答案：解析：信用证金额填写有误，应将“CURRENCY HKD AMOUNT 39000.00”修改为“USD39000.00 (SAY U.S.DOLLARS THIRTY NINE THOUSAND ONLY. * * * 10%MORE OR LESS ALLOWED)”。 原则上来...

考点：交变电流的周期和频率
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