任何可燃物的燃烧都要经历()、着火、燃烧等阶段。
A.还原反应
B.熔化
C.蒸发
D.氧化分解
参考答案:D
4.My hands are dirty. I ______ the wall the whole morning but haven’t finished yet.
A.have painted
B.have been painting
C.am painting
D.Painted
实验室用4 mol SO2与2 mol O2进行下列反应:2SO2(g)+O2(g)2SO3(g) △H= -196. 64 kJ/mol,当放出
314. 624 kJ热量时,SO2的转化率为 [ ]
A.40%
B.50%
C.80%
D.90%