请看GL关于锅炉和燃烧器旁边张贴警示牌的规范,(复制:6. Purging of combustion chamber and flues,
exhaust gas ducting
6.1 The combustion chamber and flues are to be
adequately purged with air prior to every burner startup.
A warning sign is to be mounted to this effect.)
请问这是怎么样的一个警示牌呢??上面怎么描述啊??
请高人指点~~~3Q