型煤
In outer suburbs and counties, briquettes will be used gradually. 对于远郊区县，逐步改用型煤。
For different briquettes some peculiarities were observed.Namely, only for biobriquette low presence of dialkyl sulphides and aliphatic thiols was registered. 对于生物型煤来说，仅检测到少量二烷基硫醚和脂肪硫醇的存在。
