题目

下列物质露置于空气中，因发生化学变化而使质量增加的是(  ) A．浓硫酸  B．烧碱  C．浓盐酸  D．双氧水 答案：BOnly when possible to settle the problem, ________．A.does the chief editor comeB.the chief editor comesC.does the chief editor comesD.the chief editor come