When the relief valve opens it discharges high pressure refrigerant vapor to the （）.

A . have a larger than normal dead band B . produce excessive speed response to a load change C . respond slowly to any change in engine load D . stabilize engine speed at the new governor setting

A . just B . nearly C . merely D . already

A . after TDC B . before TDC C . after BDC D . before BDC

A . tape face B . tapered face C . surface D . thinner face

A . before TDC and close after BDC B . after TDC and close after BDC C . before TDC and close before BDC D . after TDC and close before BDC

A . you are entering a space containing poisonous vapors B . you are entering a space containing explosive gases C . the regulator of the breathing apparatus malfunctions D . the face piece of the breathing device is too tight

A . a clogged filter element B . excessive lube oil pump discharge pressure C . excessive lube oil flow D . excessively hot lube oil

A . a low load on the unit B . a clogged pump suction strainer C . a blockage in the line between the pump and hydraulic motor D . the hydraulic motor turning too fast

A . no fuel will be delivered through the nozzle B . the nozzle will overheat and crack C . time of injection will change D . fuel will leak into the drain line

A . A gate valve B . A globe valve C . Any check valve D . Any needle valve

A . the direct acting relief valve is used for controlling lower flows and pressure B . the pilot operated relief valve is used for controlling higher flows and pressure C . the pilot operated relief valve is used for controlling lower flows and pressure D . the controlling accuracy of direct acting relief valve is worse than that of the pilot operated relief valve

A . excessively late injection timing for each cylinder B . incorrectly adjusted intake valve timing C . incorrectly adjusted fuel injector D . incorrectly adjusted intake valve clearance

A . later and close sooner B . sooner and close later C . sooner and close sooner D . later and close later

A . Regulation of discharge pressure from cargo pumps B . Maintaining constant velocity in cargo lines C . Regulation of suction head on cargo pumps D . To maintain a tank or void at atmospheric pressure

A . flame stopper B . flame screen C . flame filter D . flame restrictor

A . cargo pump pressure gauges B . crossover lines interconnecting two pumps C . suction side of pumps D . atmosphere through pump vent

A . after TDC B . before TDC C . after BDC D . before BDC

A . liquid in the cylinder B . low compression in the cylinder C . high exhaust temperature D . poor fuel penetratio

A . Globe valve B . Butterfly valve C . Gate valve D . Packless valve

A . relieve excess fuel oil pressure during the “off” fire cycle B . admit water to the dry pipe C . throttle the forced draft fan output for proper combustion D . reduce excess steam pressure in the boiler

A . Trip the pump relief valve B . Order the dock man to shut down C . Call the owner，operator，or terminal supervisor D . Run out the vessel's or terminal's fire hose

A . after TDC B . before TDC C . after BDC D . before BDC

A.produce a scavenging effect in the combustion space B.equalize cylinder and exhaust manifold pressures C.alleviate the difference in valve size between the intake and exhaust D.flush out condensate that collects after each compression stroke

A:正确; B:错误