问题
选择题
was your last weekend? It was not bad. [ ]
A. How about
B. How
C. What
D. What about
答案
答案：B
搜题请搜索小程序“爱下问搜题”
was your last weekend? It was not bad. [ ]
A. How about
B. How
C. What
D. What about
答案：B
，摩尔质量为M，阿伏伽德罗常数为NA，则质量为m的水所含的分子数为 ，水分子的体积为 。