单项选择题
A.in B.at C.on D.for
A.No further securing is usually required B.Containers must have vertical lashings if they do not have twist lock securing C.All containers must have vertical and horizontal lashings D.The container must be locked into the cell guide
A.shall be carried on deck B.shall be carried under deck C.may be carried on or under deck D.may not be carried on or under deck