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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
参考答案
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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 requiredB
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Three containers
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Restrains the container against horizontal motion
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