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
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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.
A. Turnbuckles
B. Lashing bars
C. Twist locks
D. Lashing wires -
单项选择题
（）are used to secure the second and the third tiers of containers.
A. Turnbuckles
B. Lashing bars
C. Twist locks
D. Lashing wires
