GB 20800.2-2006
General rules of explosion-protect techniques of reciprocating internal combustion engines for explosive atmospheres - Part 2: Group Ⅱengines for use in flammable dust atmospheres
爆炸性环境用往复式内燃机防爆技术通则 第2部分：可燃性粉尘环境用Ⅱ类内燃机
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