My father stopped after he finished writing the report.
A:smoke
B:to smoke
C:smoked
求阴影部分面积
【提出问题】甲烷燃烧后生成那些物质?
【查阅资料】含碳元素的物资完全燃烧生成CO2,不完全燃烧生成CO;无水CuSO4遇水变蓝.