原浆配制的要点是什么？
参考答案：
在选定粘土的基础上，加入适量的纯碱或其他处理剂，以提高粘土的造浆率，配制一定数量某个比重的泥浆。
完成对话。
Millie: Hi, Sandy, 1 you _____ (start) your history project yet?
Sandy: Yes. I 2 (look) on the Internet to get some ideas, but I 3 (not write)
the report yet.
Millie: What 4 you _____ (decide) to write about?
Sandy: I want to write about Tianjin. 5 you _____ (be) there?
Millie: Yes. I 6 (go) there with my family last year. I think Tianjin 7
(not change) much.
Sandy: I think there 8 (be) some changes. I 9 already _____ (learn) a lot
about the history of that city.
下列说法正确的是（ ）
A．NaOH的摩尔质量是0.040kg/mol
B．1molH2的质量与它的相对分子质量相等
C．1molH2O的质量为18g/mol
D．氧气的摩尔质量在数值上等于它的相对分子质量
