题目

With a lot of difficult problems        , the man felt like a cat on a hot brick. A. settling                       B. settled           C. to settle      D. being settled   答案：C 某化学实验室有一瓶失去标签的碱溶液，可能是氢氧化钠或氢氧化钙溶液；小王同学认为是氢氧化钙溶液．请你按小王同学的猜想，进行下列实验探究，并按要求填写写表：