A.liquid
B.oily mixture
C.emulsion
D.vapor
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A.liquid
B.gas
C.solid
D.water only
A.balance
B.not balance
C.be more than
D.be less than
A.ice
B.wooden board
C.iron plate
D.cotton waste
A.gas oil
B.diesel oil
C.chemical compound
D.Freon-12
A.the toping light
B.the board brake
C.the fail-safe
D.the barrel shaft
最新試題
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
Low compressor head pressure in a refrigeration system can be caused by（）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）
When the steering gear is in operation, you should （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
A salinity indicator is used to determine the （）.
Which of the listed pumps is NOT a positive displacement pump?（）