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【单选题】
"I passed by the skin of my teeth" means:A.
I passed but with a very low score.
B.
I passed with a very high score.
C.
I passed by cheating.
D.
I have gum disease(牙龈炎), and my teeth are falling out.
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皮皮学刷刷变学霸
举一反三
【单选题】Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?
A.
Plugged injector nozzles
B.
Excessive fuel injection
C.
Very late injection timing
D.
Incorrect crankshaft clearance
【单选题】Most hydraulic steering gears are fitted with relief valves which .
A.
function when the rudder is amidships
B.
relieve excess whip pressure from the hydraulic oil system
C.
protect the piping assembly from external rudder shock
D.
relieve excessive telemotor pressure
【单选题】Cargo pump relief valves are piped to the ______．
A.
cargo pump pressure gauges
B.
crossover lines interconnecting two pumps
C.
suction side of pumps
D.
atmosphere through pump vents
【单选题】下面关于熵的说法中正确的是（ ）
A.
熵虽是态函数，但体系的熵变跟热力学过程有关
B.
在 P - V 图上绝热线和等温线可以多次相交
C.
在状态空间中，绝热线可以相交
D.
对于可逆绝热过程熵是不变的
【单选题】Blow-off of the relief valves of the engines cylinders may be caused by _____.
A.
too low lead
B.
water in fuel
C.
too tight spring
D.
leakage
【简答题】变频器参数设置中,P4表示( )P5表示( )P6表示( )
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