知识贝壳
知识贝壳
所属栏目：英汉双解化学
A type of oillamp for use in coal mines designed so thatit will not ignite any methane (firedamp)present and cause an explosion. The flameis surrounded by a fine metal gauze whichdissipates the heat from the flame but nev-er reaches the ignition temperatu ......（本文共 405 字 ） [阅读本文] >>