單項選擇題（） is not one of the winch controls.
A.a master controller or switchbox
B.a group of relays
C.contactors
D.a solenoid brake
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1.單項選擇題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
2.單項選擇題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
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