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【判断题】
在有隔热保温要求的工程设计时,应尽量选用热容量(或比热)大、导热系数小的材料。A.
正确
B.
错误
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皮皮学刷刷变学霸
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 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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