單項選擇題When（）clean ballast water from any vessel，an application shall be made to Harbor Authorities for approval.
A.discharging
B.recircling
C.loading
D.taking in
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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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What is/are the advantage（s）of cranes over conventional cargo booms（）.
題型：單項選擇題
How should you signal the crane operator to lower the boom and raise the load（）.
題型：單項選擇題
The item（）is not the advantage of the hydraulic winch．
題型：單項選擇題
Which of the following statements is FALSE concerning cranes being installed on the centerline of vessels（）.
題型：單項選擇題
How should you signal the crane operator to move slowly（）.
題型：單項選擇題