A.gas oil
B.diesel oil
C.chemical compound
D.Freon-12
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A.the toping light
B.the board brake
C.the fail-safe
D.the barrel shaft
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
最新試題
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
A grease gun is generally used to lubricate a （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
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 （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
A pressure drop through the refrigerant liquid line may cause （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）