题目内容

直流稳压电源中整流电路的任务是( )。

A. 将交流变为直流
B. 将正弦波变为方波
C. 将高频变为低频

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串联型稳压电源正常工作的条件是 :其调整管必须工作于放大状态,即必须满足。

A. VI = VO + VCES
B. VI < VO + VCES
C. VI ≠ VO + VCES
D. VI > VO + VCES

W7805输出电压 V，而W7912则输出电压V。

The cultivated land in the U.S. makes up _ __ of the total land, and people who are engaged in farming make up only 2.7% of the total population.

A. 21%
B. 31%
C. 41%
D. 51%

The Constitution of the United States provides that __ shall be President of the Senate.

A. the Secretary of State
B. the Chief Justice
C. the President
D. the Vice President