题目：
将正弦交流电经过整流器处理后，得到的电流波形刚好去掉了半周，如图，它的有效值是（ ）
A．1A
B．
A2
C．
A2 2
D．2A
答案：
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ABCD
将正弦交流电经过整流器处理后，得到的电流波形刚好去掉了半周，如图，它的有效值是（
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