If protective walls are provided, they shall be constructed of noncombustible materials.
如果提供了保护墙, 它们应用不可燃材料建造.
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If protective walls or roofs are provided, they should be constructed of noncombustible materials.
如果提供了保护墙或屋顶, 它们应用不可燃材料建造.
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由于爆震波所造成的非燃性瓦砾常常把易燃材料复盖因而可防止其燃烧.
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