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【单选题】
单相半波可控整流电路,在感性负载的情况下,若一个周期内流过晶闸管的平均电流等于流过续流二极管的电流时,晶闸管的导通角应为 (A.
A 180 °
B.
B 120 °
C.
90
D.
60°
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举一反三
【单选题】By the year of 2020, the world energy consumption is predicted to increase by______
A.
100%
B.
200%
C.
50%
D.
150%
【单选题】In China, as in many parts of the world, energy __________ is an issue which gets a lot of attention these days.
A.
preservation
B.
reservation
C.
conservation
D.
consideration
【简答题】Passage two The energy cr, which is being felt around the world, has dramatized how the careless use of the earth's resources has brought the whole world to the drink of disaster. The over develop...
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