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【单选题】
矿山电压在____V以上和由于绝缘损坏可能带有危险电压的电气设备的金属外壳、构架必须有保护接地．A.
12
B.
24
C.
36
D.
60
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举一反三
【单选题】乙类互补对称功放提供的电源为Vcc、-Vcc,负载RL上允许输出的最大不失真功率Pomax= 。
A.
VccVcc/RL
B.
VccVcc/2RL
C.
VccVcc/4RL
【单选题】The world's first test-tube baby was ______________ who was born in Britain in 1978.
A.
Louise Brown
B.
Louise Paxton
C.
Lucy Brown
D.
Lilly Brown
【单选题】The first test-tube baby of China was born in Beijing on March 10, _______.
A.
1980
B.
1985
C.
1988
D.
1998
【单选题】The Art Director starts the meeting by remembering the type of monitor she used when she first started in the business. Her first display device was a CRT monitor that used a ____ ray tube.
A.
television
B.
candela
C.
cathode
D.
crystal
【单选题】The tube was first built in the ____ of London.
A.
centre and north
B.
east and north
C.
west and south
D.
centre and south
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