单项选择题
We secure and tighten the lashing bars for the containers with （）.
A. turnbuckles B. lashing bars C. twist locks D. lashing wires
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.
单项选择题 Get ready for （）the cargo on deck.
