题目

Welcome to the Painting Competition for Woodlands StudentsThe International Anti-Drug (禁毒) Day this year is coming soon. In order to raise teenagers’ awareness (意识) to fight against drug taking, the City Art Council is going to hold a painting competition for the students in our city. Students who want to take part in the competition can hand in their own 2D paintings in either of the following two ways:★Each school will be provided with a box for students to put in their paintings. Boxes will be picked up by the City Art Council on Thursday, June 23rd, 2016, before the end of the 下列四个图象,分别对应四种操作过程,其中正确的是(   )A.向pH=2的酸溶液中不断加水B.向NaOH溶液中逐滴加入稀盐酸C.向一定量的水中持续加入食盐(m表示食盐的质量,A%表示溶质质量分数)D.等质量的锌、铁与足量的稀硫酸反应,产生氢气的质量随反应时间t的变化
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