题目

下列实验操作正确的是（ ） A． 点燃酒精灯  B． 铁丝在氧气中燃烧 C． 称量氯化钠  D． 闻气体 答案：【考点】实验操作注意事项的探究． 【专题】课本知识同类信息． 【分析】A、点燃酒精灯要用火柴或纸条； B、铁丝在氧气中剧烈燃烧，火星四射，溅落的熔化物，温度较高，会炸裂瓶底； C、天平称量物体要左物右码，易潮解物品要放在必须放在玻璃器皿中； D、闻气体的气味时，防止气体有毒，应_____ you promise to come to help me, I don't mind what time tomorrow you arrive at my place. [     ]A. So long as B. So far as C. As good as D. As well as