问题:
A . Use either 1 or 2 tiers of dunnage,spacing the pieces in each tier a foot apart,and lay pieces in the bottom tier diagonally to the ship's side
B . Use 1 tier of dunnage,laying the pieces tightly together to form a solid floor over the steel deck
C . Use 2 tiers of dunnage,spacing the pieces in the bottom tier about a foot apart and the pieces in the top tier 6 inches apart
D . Use 2 tiers of dunnage,spacing the pieces in the bottom tier about a foot apart and the pieces in the top tier together
● 参考解析
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