单项选择题
The port clearance for a ship should be granted（）the completion of loading or discharging in the port.
A.before
B.when
C.after
D.during
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相关考题
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单项选择题
The load chart of a ship crane enables the operator to combine the load radius with boom length to determine the（）.
A.maximum counter weight required
B.minimum horsepower required
C.hoist rope strength
D.allowable load -
单项选择题
The boom indicator tells the operator at what angle the boom is compared to the（）.
A.horizontal position of the boom
B.vertical position of the boom
C.horizontal position of the load being lifted
D.vertical position of the load being lifted -
单项选择题
The boom indicator on a crane will indicate the（）.
A.length of the boom
B.angle of the boom
C.lifting capacity of the boom
D.direction of the boom
