A.the toping light
B.the board brake
C.the fail-safe
D.the barrel shaft
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A.principle
B.medium
C.instruction
D.voltage
A.hoisting；luffing；slewing
B.lifting；raising；lowering
C.rotating；raising；handling
D.hosting；lowering；moving
A.length
B.slack
C.height
D.rotation direction
A.boilers
B.bow thrusters
C.stabilizers
D.hatch covers
A.a motor-driven steering wheel
B.a pneumatic steering wheel
C.a hand-driven steering wheel
D.an electric steering wheel
最新試題
Which of the following statements is correct concerning heat transfer?（）
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
Which of the listed pumps is NOT a positive displacement pump?（）
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?（）