单选题There should be at least two tiers of dunnage for the cargo loaded on tank top，the first tier laid（）.Ato prevent crushing of cargoBto separate cargoesCto prevent small containers from hanging up on the upper edgesDto offer the drainage
单选题
There should be at least two tiers of dunnage for the cargo loaded on tank top，the first tier laid（）.
A
to prevent crushing of cargo
B
to separate cargoes
C
to prevent small containers from hanging up on the upper edges
D
to offer the drainage
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