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OSI模型有7层结构,是一个开放性的系统互联参考模型,其最底下两层是()。

A.网络层

B.数据链路层

C.物理层

D.传输层

E.应用层

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第1题

A cracked diaphragm in a thermostatic expansion valve will cause the valve to _____.A.retu

A cracked diaphragm in a thermostatic expansion valve will cause the valve to _____.

A.return to a neutral position

B.flood the evaporator

C.open

D.close

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第2题

Thermostatic expansion valve are _____.A.either all the way open or all the way closedB.no

Thermostatic expansion valve are _____.

A.either all the way open or all the way closed

B.normally open

C.throttled depending on load

D.controlled by suction pressure

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第3题

A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water _____.

A.around the engine

B.around the cooler

C.to the expansion tank

D.overboard

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第4题

A ruptured diaphragm in a thermostatic expansion valve will cause the valve to _____.

A.open

B.close

C.remain in its position

D.flood the evaporator with refrigerant

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第5题

When replacing a thermostatic expansion valve sensing bulb, it is necessary toA.apply a li

When replacing a thermostatic expansion valve sensing bulb, it is necessary to

A.apply a light film of oil to increase heat transfer

B.apply a light film of oil to prevent oxidation

C.apply a heavy coating of grease to function as a heat sink

D.carefully coat the device with silicone sealant to reduce the effects of convective cooling

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第6题

What is the function of thermostatic expansion valve in a compression refrigeration system

A.nonexistent

B.for controlling pressure

C.for controlling superheat

D.for controlling the solenoid valve

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第7题

When you adjust a thermostatic expansion valve, _____.A.refrigerant must be bled off the s

When you adjust a thermostatic expansion valve, _____.

A.refrigerant must be bled off the sensing line before adjustments are made

B.all refrigerant must be pumped into the receiver before adjustments are made

C.time must be allowed for conditions to stabilize in the evaporator before further adjustments are made

D.all refrigerant must be routed through the dehydrator while changing the superheat setting

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第8题

If the superheat value of a thermostatic expansion valve is set too low, the _.A.the sucti

If the superheat value of a thermostatic expansion valve is set too low, the _.

A.the suction line will be abnormally cold and liquid may slug back to the compressor

B.the suction line will be hot due to a reduced amount of refrigerant returning to the compressor

C.the temperature of the refrigerant within the condenser will remain the same

D.the temperature of the refrigerant passing through the sub-cooler will decrease

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第9题

Which of the following statements is correct concerning a typical shipboard multi-coil ref
rigeration system?

A.The liquid receiver functions to collect and remove non-condensable gases

B.A thermostatic expansion valve is used to control refrigerated space temperature

C.Refrigerant temperature in an evaporator is directly related to refrigerant pressure

D.Dehydrators must be used continuously in a refrigeration system

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第10题

During working, thermostatic expansion valve should be _____.

A.either all the way open or all the way closed

B.normally fully open

C.throttled depending on load

D.controlled by liquefied pressure

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