题目

书面表达,假如你是Tom ,以下是你的成绩单。请向你的好朋友Jim写信汇报你的成绩。 Positive commentsEnglish teacherPE teacherMath teacher Good at English; listening is much better than speakingOne of the best boysHard-working Negative commentsHistory teacherScience teacher Could do betterA lazy student 答案:Dear Jim, How is it going? Things are fine here. I got my report card today. Luckily I did OK this time. My English teacher said I was good at English, but my listening is much better than speaking. My math teacher said I was hard-working and my PE teacher said I was one of the best boys in my class. However my history teacher said I could do better. Another disappointed result was in scienc 有100mL氯化镁和氯化铝的混合溶液,其中c(Mg2+)为0.2mol·L-1, c(Cl-)为1.3mol·L-1。要使Mg2+全部转化为沉淀分离出来,至少需加2mol·L-1NaOH溶液的体积为         A. 65mL          B. 72mL       C. 80mL         D. 128mL
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