短语词组短语halon n extinguisher 哈龙灭火器halon fire extinguisher detail 卤化物灭火器halon fire extinguisher 卤代烷灭火器;卤化物灭火器;海伦灭火瓶Halon n fire extinguisher 卤代烷灭火器 返回 halon extinguisher