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【单选题】
目前录像机都采用了开关式稳压电源，它具有体积小、效率高，适用电源变化范围宽的特点。但是由于（）处在400多伏的压，当负载短路或环境温度过高的情况下该管易于击穿A.
整流管
B.
稳压管
C.
开关管
D.
放大管
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【单选题】Which of the statement is true about the American president?
A.
The president heads the executive branch which takes the responsibility of carrying out the laws.
B.
The President has legislative power and is responsible for the foreign affairs of the country.
C.
The President has the power to appoint and dismiss supreme judges and members of congress.
D.
American national government always speak the same voices that of the president and that of Congress.
【单选题】Which American president witnessed the disintegration of the Soviet Union and the Westernization ofEast European countries?
A.
Carter.
B.
Reagan.
C.
Bush.
D.
Clinton.
【多选题】What are the powers of American President?
A.
The president has the authority to appoint federal judges when vaccines occur.
B.
The President can dismiss the cabinet members at will for no cause.
C.
The President can veto any bill passed by Congress.
D.
The President can issue regulations and directives.
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