单项选择题X 纠错
A.the manual trick wheel is engaged for steering
B.the variable stroke pump is off stroke
C.a rudder order is given by the control system
D.an electric power system failure occurs at the steering gear
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单项选择题
A.cool the expansion valve
B.prevent refrigerant superheating
C.condense the refrigerant gas
D.prevent motor overheating
单项选择题
A.Closing of the solenoid valve
B.Closing of the expansion valve
C.An increase in the suction pressure
D.Decreasing the suction pressure
单项选择题
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
单项选择题
A.suppressant additive
B.dispersant additive
C.extreme pressure additive
D.viscosity improver additive
单项选择题
A.centrifugal pumps
B.jet pumps
C.propeller pumps
D.reciprocating pumps
单项选择题
A.a compressed packing gland
B.lantern tings between the packing rings
C.a liquid seal
D.the stuffing box gland
单项选择题
A.loss of second stage vacuum
B.contamination of the distillate
C.lower feed inlet temperature
D.contamination of the second stage condenser
单项选择题
A.total head
B.discharge head
C.net positive suction head
D.suction head
单项选择题
A.slide block
B.tilting box
C.pintle
D.reaction ring
单项选择题
A.Liquids with different viscosities will always have the same specific gravity
B.Liquids with different viscosities will never have the same specific gravity
C.Viscosity and specific gravity are directly proportional
D.Viscosity and specific gravity are not related in that one does not define or limit the other