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After he left university,he turneddoctor.

A. /;a
B. an;a
C. a;a
D. the;/

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Every day people throw away a lot of rubbish.How to get rid of rubbish is big problem.

A. the;/;a
B. /;the;/
C. /;the;a
D. /;the;the

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An;an
B. An;a
C. /;an
D. The;the

单相桥式半控整流电路中，常采用两个晶闸管共_连接形式，两个二极管共_连接形式。

单相桥式半控整流电路中，输入电压为U2，晶闸管承受的最大正反向电压为_______，二极管承受的最大正向电压为_，可能承受的最大反向电压为______。