A.principle
B.medium
C.instruction
D.voltage
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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
A.the tiller arms
B.the swivel blocks
C.hunting gears
D.the rams
最新試題
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
A salinity indicator is used to determine the （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
When the steering gear is in operation, you should （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
A pressure drop through the refrigerant liquid line may cause （）.