fire-retardant roof covering
... covering fire 掩护火力 ; 掩护射击 fire-retardant roof covering 阻燃屋面覆盖层 squad covering fire 掩护射击 ...
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... 构造覆盖层 structural overburden 易燃屋面覆盖层 flammable roof covering 阻燃屋面覆盖层 retardant roof covering ...
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