單項(xiàng)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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1.單項(xiàng)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

3.單項(xiàng)選擇題In a general cargo crane, three principal movements are （）； （）； （）.

A.hoisting；luffing；slewing
B.lifting；raising；lowering
C.rotating；raising；handling
D.hosting；lowering；moving

4.單項(xiàng)選擇題A warp end may be fitted for operating the derrick topping wire which adjusts the derrick （）.

A.length
B.slack
C.height
D.rotation direction

5.單項(xiàng)選擇題These include deck machinery such as mooring equipment, anchor handling equipment, cranes and （）.

A.boilers
B.bow thrusters
C.stabilizers
D.hatch covers