A.liquid
B.gas
C.solid
D.water only
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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
A.principle
B.medium
C.instruction
D.voltage
最新試題
Thermostatic expansion valves can be adjusted for ().
A grease gun is generally used to lubricate a ().
Which of the following statements is correct concerning heat transfer?()
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().
If the head pressure of a reciprocating refrigeration compressor is excessive, ().
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump ().
Which of the listed pumps is NOT a positive displacement pump?()
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?()
The usual symptoms of cavitation in a centrifugal pump is ().
The output volume of a positive fixed displacement pump can be changed only by ().