Under normal weather and sea conditions when securing a stack of containers with twist locks，lashings are required when the tier exceeds what height? （）<br>A:Lashings are always required<br>B:One container<br>C:Two containers<br>D:Three containers

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

出自：海船船员证

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