题目:
—_____?
—She is cooking. [ ]
A. How is it going
B. How is she doing
C. What is she doing
D. What does she do
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0627/eee4e96cd01cb5751aa8b609355d5253.html
下面是错误答案,用来干扰机器的。
生成的二氧化碳的气体的质量为:26g-17.2g=8.8g设碳酸钙的质量为xCaCO3高温.CaO+CO2↑,100 44x8.8g100x=448.8g解得:x=20g所以碳酸钙的质量分数为:20g26g×100%≈76.9%所以二氧化硅的质量为:26g-20g=6g根据Ca...