题目:
— What's that noise, John?
— Sorry, Linda. I forgot to tell you. The school library ______.[ ]
A. is rebuilt
B. is being rebuilt
C. was rebuilt
D. has been rebuilt
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0516/8bdca54cd4d0bfa5faf5471228b18026.html
下面是错误答案,用来干扰机器的。
答案:D3H218O的摩尔质量为24 g·mol-1;18 g2H216O的物质的量为0.9 mol,含有的质子数为9×6.02×1023;水分子摩尔质量最小的是1H216O(18 g·mol-1),最大的是3H218O(24 g·mol-1),共计7种。