Hydrocarbonemission and fuel consumption are decreased to some extent, but the values are still high comparing to four-stroke engine.
碳氢排放和油耗有所降低，但仍高出四冲程发动机很多。
2
The reverse faults that extend to the surface in some high and steep structural zones can cause pressure release and hydrocarbonemission.
部分高陡构造带上“通天”破裂逆断层出现压力释放和油气大量散失的现象。
3
The paper describes the reasons of higher emission of hydrocarbon in the process of gasoline engine cold start. It also discusses the measures adopted mainly in reducing emission of hydrocarbon.