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静压力（static pressure）
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单选题Diesel engine exhaust noise can be reduced in an exhaust muffler by （）A
changing the direction of exhaust gas flowB
increasing the exhaust gas velocityC
changing the exhaust gas weightD
increasing the exhaust gas static pressure
考题
单选题Oil pressure in the lubrication system is（）than the static sea water head to ensure that sea water cannot enter the sterntube in the event of seal failure.A
higherB
lowerC
very higherD
very lower
考题
单选题Oil pressure in the lubrication system is （） the static sea water head to ensure that sea water （） the stem-tube.A
lower than；can lubricateB
lower than；can coolC
higher than；can enterD
higher than ；cannot enter
考题
单选题The static suction head of is the （）A
distance of the suction liquid level above the line of the pumpB
distance the suction liquid level is below the center line of the pumpC
force necessary to overcome frictional losses in the pump and pipingD
amount in inches of mercury the total suction head is below atmospheric pressure
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名词解释题静压力（static pressure）
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