单选题Under normal weather and sea conditions when securing a stack of containers with twist locks，lashings are required when the tier exceeds what height? （）ALashings are always requiredBOne containerCTwo containersDThree containers
单选题
Under normal weather and sea conditions when securing a stack of containers with twist locks，lashings are required when the tier exceeds what height? （）
A
Lashings are always required
B
One container
C
Two containers
D
Three containers
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