There should be at least two tiers of dunnage for the cargo loaded on tank top，the first tier laid（）.
- Ato prevent crushing of cargo
- Bto separate cargoes
- Cto prevent small containers from hanging up on the upper edges
- Dto offer the drainage
问题
There should be at least two tiers of
参考解析：
分类：杂货运输及有关规则题库
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