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【单选题】
In this circuit, the diode is ideal diode(forward voltage is 0). If input voltage ui is sinusoidal wave, when ui>0, uo=__________. When ui<0, uo=_______. This circuit is called _____________ circuit.
A.
0, ui,  half-wave rectification.
B.
ui, ui, half-wave rectification.
C.
ui, 0, half-wave rectifivation
D.
ui, 0, full-wave rectifivation
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