[问答题] 简述工作分析的特征。

LNG低温钢瓶充装操作规程是什么？ 简述工作分析的主要程序。 Generally，the first action in extinguishing an LFG fire caused by escaping gas is to（）. ["sweep flames away with water spray","shut off the leak","use a chemical foam fire extinguisher","call the local fire department"] Gas masks（）. ["should be worn while fighting a fire","can be used in atmospheres deficient in oxygen","filter contaminants from air that is to be breathed","may be substituted for a self-contained breathing apparatu"] 填料才开始使用特别容易产生室内燃气阀门的填料函泄漏。 简述工作分析的特征。