第1题:
The display screen is the most common (72) device used to show you what the computer is doing.
A.input
B.printing
C.output
D.electronic
第2题:
第3题:
The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.
A.large conical springs
B.compressed air pressure
C.hydraulic pressure
D.exhaust gas pressure
第4题:
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第7题:
第8题:
what is the use of “unloader “on main air compressor ?
第9题:
第10题: