单项选择题

（） is not usually used in liquid cargo systems.

A.Hydraulic drive systems
B.Electric drive systems
C.Steam drive systems
D.Man-powered drive systems

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单项选择题

（） is not one of the winch controls.

A.a master controller or switchbox
B.a group of relays
C.contactors
D.a solenoid brake

单项选择题

When checking the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，the atmosphere must be sampled（）.

A.one meter from the tank bottom and one meter below the tank top
B.one half the ullage of the tank and one meter below the tank top
C.one half the ullage of the tank and one meter above the tank bottom
D.at three meter intervals from the tank top

单项选择题

When a cargo boom or crane is rated at varying capacities，there will be a table at the controls which relates safe working load to（）.

A.winch speed
B.boom strength
C.load radius
D.cable strength