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

[单选题]As a high pressure system approaches，the barometer reading（）.A . stays the sameB . fallsC . risesD . falls rapidly

[单选题]H．igh cylinder firing pressure, accompanied by low exhaust temperature, can result from ___.A．improper fuel rack positingB．lengthy exhaust valve durationC．extend operation at light loadD．excessively early injection timing

[单选题]The high pressure in fuel injection system of the diesel engine is produced by the （）.A . injector pumpB . fuel injectorC . governorD . turbocharger

[单选题]PRESSURE DROP AND SPILL VALVE活门的作用是（）。A . 当高压燃油泵的出口压力过高时，该活门打开，释放一部分压力B . 当低压燃油泵的出口压力过高时，该活门打开，释放一部分压力C . 当PRSOV的出口压力过高时，该活门打开，释放一部分压力D . 当燃油喷嘴的出口压力过高时，该活门打开，释放一部分压力

[单选题]The period of valve overlap is when （）.A . the inlet valve is openB . the exhaust valve is openC . both valves are closeD . both valves are ope

The evaporating pressure in R22 vapor compression refrigeration plant should be

[单选题]The needle valve will open when the fuel pressure acting on the needle valve （） exerts a sufficient force to overcome the spring compression.A . tape faceB . tapered faceC . surfaceD . thinner face

[单选题]When the starting air valve closes on one cylinder, another starting air valve has （） opened on another cylinder whose piston has just commenced its downward stroke.A . justB . nearlyC . merelyD . already

[单选题]Today, widespread social pressure to immediately go to college in conjuncti

[单选题]Today, widespread social pressure to immediately go to college in conjuncti