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輪機英語單項選擇題每日一練(2019.08.12)

單項選擇題
（）is harmful for fuel pumps, fuel valves, cylinder liner, exhaust valve seats, and the turbocharger blades as well.
A.Bad combustion of the fuel
B.Bad atomization of the fuel
C.Liquid contaminants
D.Solid contaminants
單項選擇題
Most conducting materials such as copper, aluminum, iron, nickel, and tungsten （）.
A.increase in resistance with increased temperature
B.increase in resistance with decreased temperature
C.decrease in resistance with increased temperature
D.increase in conductance with increased temperature
單項選擇題
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
單項選擇題
The suction - force principle of operation is a typical characteristic of （）.
A.centrifugal pumps
B.jet pumps
C.propeller pumps
D.reciprocating pumps
單項選擇題
Which of the following statements is correct concerning the “flash point ” of a liquid?（）
A.It is lower than the ignition temperature
B.It is the temperature at which a substance will spontaneously ignite
C.It is the temperature at which a substance, when ignited, will continue to bum
D.It is the temperature at which the released vapors will fall within the explosive range

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