單項選擇題

The inner part of the condenser should be cleaned with （）.

A.gas oil
B.diesel oil
C.chemical compound
D.Freon-12

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單項選擇題

In the cargo winch, spur reduction gearing transfers the motor drive to （）.

A.the toping light
B.the board brake
C.the fail-safe
D.the barrel shaft

單項選擇題

For occasional heavy loads, two cranes can be arranged to work together. The operating （） for deck crane motors may be hydraulic electric.

A.principle
B.medium
C.instruction
D.voltage

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