A.ice
B.wooden board
C.iron plate
D.cotton waste
您可能感興趣的試卷
你可能感興趣的試題
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
A.length
B.slack
C.height
D.rotation direction
最新試題
The usual symptoms of cavitation in a centrifugal pump is （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
A salinity indicator is used to determine the （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can 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 （）.
Thermostatic expansion valves can be adjusted for （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.