单项选择题
A.maximize your deck load
B.distribute lumber so that those stowing most compactly per unit of weight are in the upper holds
C.place the heaviest woods in the lower holds
D.keep the vessel's frame spaces free from lumber
单项选择题 In observing rig motion while under tow，the period of roll is the time difference between（）.
单项选择题 If the cargo gear on your vessel is equipped with a regular guy and a preventer guy，you should（）.
单项选择题 If reefer spaces are not properly cleaned prior to loading cargo，it will most likely cause（）.