单项选择题

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

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单项选择题

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

单项选择题

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

单项选择题

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

In a general cargo crane, three principal movements are （）； （）； （）.