A. tend to twist about its long axis
B. expand in length and in diameter
C. contract in length and expand in diameter
D. flex at right angles to the applied pressure
[单选题]If you install a new hydraulic hose in a hydraulic system, the hose must be long enough to allow for contraction to preventA．failure of the hydraulic hoseB．excessive flow through the lineC．friction in other areas of the hydraulic systemD．overheating
[名词解释] 水压力（hydraulic pressure）
[单选题]As a high pressure system approaches，the barometer reading（）.A . stays the sameB . fallsC . risesD . falls rapidly
[单选题]In the （） pressure charging system the pulse of energy that occur as the exhaust is released from the cylinder to improve the output of the turbocharger.A . constantB . pulseC . highD . none of the above
[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
[名词解释] 压力抑制系统 pressure suppression system
[单选题]Under stress, people's blood pressure goes up, _________their race or sex.A． whicheverB． no matter howC． whetherD． no matter what
[单选题]In a flexible exchange rate system, is a country's currency likely to depre
Some persons gain goal and direction from their tensions;others ________ under p
Some persons gain goal and direction from their tensions; others ___ under press