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判断题
prefilter pressure high/low是需要检查滤器前压力传感器、滤器、管路、血流。（）
A
对
B
错
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单选题Late fuel injection timing is indicated by （）A
lower than normal cylinder pressure and low exhaust temperatureB
lower than normal cylinder pressure and high exhaust temperatureC
higher than normal cylinder pressure and low exhaust temperatureD
higher than normal cylinder pressure and high exhaust temperature
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单选题Early injection timing is indicated by （）.A
high exhaust temperature and low firing pressureB
high exhaust temperature and high firing pressureC
low exhaust temperature and low firing pressureD
low exhaust temperature and high firing pressure
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单选题In a compression refrigeration plant the refrigerant is under low pressure in the （） and under high pressure in the （）.A
compressor；condenserB
condenser；evaporatorC
throttle valve；evaporatorD
evaporator；condenser
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单选题Two well-developed high pressure areas may be separated by a（）.A
Hill of low pressureB
Trough of low pressureC
Valley of low pressureD
Ridge of low pressure
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单选题Compared to a low pressure system，generally the air in a high is（）.A
warmer，less dense，and less stableB
cool，more dense，and drierC
muggy and cloudyD
extremely moist with high relative humidity
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单选题（）causing strong winds and rough sea north west Bay of Biscay.A
Strong low pressureB
Strong high pressureC
Steep pressure gradientD
Steep gradient pressure
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单选题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）A
Low compression pressure and high exhaust temperatureB
Low firing pressure and high exhaust temperatureC
Low compression pressure and low exhaust temperatureD
Low firing pressure and low exhaust temperature
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单选题Leaky exhaust valve will result in which of the following?（） (1) high exhaust temperature; (2) low compression pressure; (3) low firing pressure.A
(1) and (2)B
(1) onlyC
(2) onlyD
(1),(2) and (3)
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单选题What separate the high pressure side from the low pressure side in a refrigeration system?（）A
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King and solenoid valvesC
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单选题The direction of the surface wind is（）.A
directly from high pressure toward low pressureB
directly from low pressure toward high pressureC
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from low pressure toward high pressure deflected by the earth's rotation
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单选题Either a low injection pressure or a leakage of piston rings is able to lead （）.A
a high exhaust temperatureB
a high smoky exhaustC
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单选题Which of the listed set of conditions indicates early fuel injection timing?（）A
Loss of engine power and high exhaust temperaturesB
Higher than normal firing pressure and low exhaust temperaturesC
High fuel consumption and high exhaust temperaturesD
Lower than normal compression pressure and high exhaust temperature
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单选题If a compressor runs continuously, the cause might be a（）A
defective thermal bulbB
clogged scale trapC
stuck high-pressure switchD
stuck low-pressure switch
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单选题An indication of a diesel engine air intake being partially clogged, is （）.A
low firing pressure and low exhaust temperaturesB
low firing pressure and normal exhaust temperaturesC
high firing pressure and low exhaust temperaturesD
high firing pressure and high exhaust temperatures
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