單項(xiàng)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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1.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

2.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

3.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

4.單項(xiàng)選擇題The hand steering is a method by which the motion of the rudder is controlled with （）.

A.a motor-driven steering wheel
B.a pneumatic steering wheel
C.a hand-driven steering wheel
D.an electric steering wheel

5.單項(xiàng)選擇題If a heavy sea strikes the rudder, the shock is transmitted through the tiller to （）.

A.the tiller arms
B.the swivel blocks
C.hunting gears
D.the rams