The proper place（）the sling is made up is the square of the hatch.

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

点击查看答案&解析

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

点击查看答案&解析