Under normal weather and sea conditions when securing a stack of containers with non-locking fittings，lashings are required when the tier exceeds what height ________．A.Lashings are always requiredB.One containerC.Two containersD.Three containers
Under normal weather and sea conditions when securing a stack of containers with non-locking fittings，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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