城市燃气分类classification: n. 1.选别;分等,分级;分选。 2.【动、植】分类( ...town gas: 城市煤气;民用煤气。 gas classification: 煤气分级heating by town gas: 城市煤气供热oxy-town gas burners: 氧气-城市煤气烧嘴下载手机词典可随时随地查词查翻译