It is obtained by distilling soft pitch in flash column under certain pressure and temperature .
It is obtained by distilling soft pitch in flash column under certain pressure and temperature .
中温沥青经过在一定的压力和温度下进行闪蒸获得。
It is obtained by distilling soft pitch in flash column under certain pressure and temperature .
中温沥青经过在一定的压力和温度下进行闪蒸获得。