防止Gas逆流的Valve是什么（难度:初级）（）

A.The tank must be gas freed

B.The tank must be ballasted

C.The tank must be vented to the atmosphere

D.The bypass valve must also be closed

The expansion valve used in a refrigeration system regulates the

A.superheat of the gas leaving the compressor

B.back pressure in the evaporator

C.temperature in the refrigerated space

D.degree of superheat of the gas leaving the evaporator

A．ensure penetration and distribution of the fuel in the combustion chamber

B．ensure the needle valve is flushed clean during each injection

C．prevent combustion gas blowback into the open needle valve

D．prevent reflected pressure waves when the needle valve close

Before discharge of cargo tank ballast is undertaken，______．

A.the deck isolating valve is open

B.flue gas isolating valve

C.blower suction valve

D.blower discharge valve

Which of the problems listed could cause erosion of the expansion valve disks and seats？

A.Overcharging the system with refrigerant

B.Faulty compressor suction valve

C.Failure of the high pressure cutout

D.Flash gas formed in the liquid line

A.Cut in another IG fan to increase gas flow

B.Open the pressure control valve until the pressure increases

C.Open the tank isolation valve to the fully open position

D.Reduce the pumping rate

A.Close the inlet and outletvalves for diesel oil

B.Open the air nozzles in the secondary combustion chamber until it stops

C.Open the air nozzles in the primary combustion chamber until it stops

D.Close inlet valve for pressurized air

A.大型tank,Bottle

B.大型Trailer,Bottle

C.大型Trailer,Glass

D.大型tank,Glass

A.CylinderCabinet→ValveBox→VMB→生产设备

B.BSGS→GIB→ValveBox→VMB→生产设备

C.Trailer→VMB→GIB→ValveBox→生产设备

D.C-Bundle→ValveBox→VMB→生产设备

A、增加B干粉溶解度

B、降低护士操作难度

C、保护支架内部O型圈

D、防止B干粉漏出