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【单选题】
如图所示桥式整流电容滤波电路,U2=20V,如果二极管D2发生开路的故障,则Uo为A.
9V
B.
18V
C.
20V
D.
24V
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举一反三
【简答题】团会议是_________的一种会议形式,团由_________产生,是_________的组织者。团产生后即由_________或主任主持召开第一次团会议。
【单选题】looking back my own learning experience, i found myself often relying on Chinese to construct English sentences.
A.
looking back my own learning experience, i found myself often relying on Chinese to construct English sentences.
B.
looking back at my own learning experience, i found myself often relying on Chinese to construct English sentences.
【简答题】In 1997, I found myself in a situation I never thought I'd be in: alone and begging for money in New York. My father had been separated from our family, and my mother had recently died from complicat...
【单选题】—Your hamburger is the best I’ve ever tasted, Ms. Black! —Thanks, Harry. _____.
A.
That’s easy to make
B.
I learned it from my parents
C.
Please don’t say so
D.
I’m glad you enjoyed it
【简答题】I found myself completely ____ by his vivid performance. A.carried out B.carried off C.carried away D.carried on
【简答题】某商店从三个厂购买了一批灯泡,甲厂占25% ,乙厂占35% ,丙厂占40% ,各厂的次品率分别为5%,4%,2% ,则 消费者买到一只次品灯泡的概率 为 (答案写小数)
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