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In preparing a cargo space for receipt of a shipment of bagged cargo，which instruction for laying dunnage should be followed? （）
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

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出自：海船船员证

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