单项选择题
Stow the derricks （）before sailing.
A. fore and aft B. up and down C. port and starboard D. left and right
单项选择题 We secure and tighten the lashing bars for the containers with （）.
单项选择题 （）are used to secure the two containers, one on top of the other.
单项选择题 （）are used to secure the second and the third tiers of containers.
