A.balance
B.not balance
C.be more than
D.be less than
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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
A.hoisting；luffing；slewing
B.lifting；raising；lowering
C.rotating；raising；handling
D.hosting；lowering；moving
最新試題
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
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 （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
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?（）
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
A pressure drop through the refrigerant liquid line may cause （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.