Actually the primary energy sources is coal-based in China result in the serious coal smokepollution which mainly to SO_2 and NO_X.
我国一次能源以煤为主,从而导致了严重的煤烟型大气污染,其中以SO_2和NO_x为主。
3
The two-stroke motorcycle special engine oil should have low smokepollution property, good lubricity, detergency, flowing property and mixotropic ability.