A.When the helm is at any angle other than amidships
B.When the six-way valve is opened
C.When the ram relief valves lift
D.When the redder angle is different from the position of the helm
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A.suppressant additive
B.dispersant additive
C.extreme pressure additive
D.viscosity improver additive
A.centrifugal pumps
B.jet pumps
C.propeller pumps
D.reciprocating pumps
A.a compressed packing gland
B.lantern tings between the packing rings
C.a liquid seal
D.the stuffing box gland
A.loss of second stage vacuum
B.contamination of the distillate
C.lower feed inlet temperature
D.contamination of the second stage condenser
A.total head
B.discharge head
C.net positive suction head
D.suction head
最新試題
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
Which of the listed pumps is NOT a positive displacement pump?（）
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
Which of the following statements is correct concerning heat transfer?（）
Thermostatic expansion valves can be adjusted for （）.
A grease gun is generally used to lubricate a （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
When the steering gear is in operation, you should （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
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?（）