单项选择题
A.which B.where C.when D.how
The port clearance for a ship should be granted（）the co...
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
The load chart of a ship crane enables the operator to ...
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
The boom indicator tells the operator at what angle the...
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
