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【简答题】
三相桥式整流电路是由一组共 极三只晶闸管和一组共 极的三只晶闸管串联后构成的,晶闸管的换在同一组内的元件进行的。每隔 度 换一次相,在电流连续时每只晶闸管导通 度。要使电路工作正常,必须任何时刻要有 只晶闸管同时导通,一个是共 极的,另一个是共 极的元件,且要求不是 的两个元件。
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【单选题】What did the writer think about his recorder when he found it left on the train? ______
A.
He wanted to send it to the old man as a report.
B.
He didn’t want to get it back because it was old and broken
C.
He thought that the old man liked the recorder very much and kept it for himself
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