Then moment _________ Mary will always remember is _________ Mr. Black gave her a lot of valuable advice on how to improve her writing. A. when; that B. that; that C. that; when D. when; where 答案:C能正确反映对应变化关系的图象是( )A. 加热一定质量的高锰酸钾固体B. 向一定量的稀硫酸中滴加氢氧化钠溶液至过量C. 向等质量的金属镁和铝中加入足量且质量分数相等的稀硫酸,生成氢气的质量与加入稀硫酸质量的关系D. 分别向等质量、等质量分数的稀盐酸中不断加入碳酸镁和氧化镁固体