A brown coal, a high-volatile bituminous coal and a low-volatile bituminous coal were pyrolysed at a slow heating rate in a thermogravimetric analyser.
在热天平上采用慢速升温制备了褐煤、高挥发分烟煤和低挥发分烟煤的半焦。
2
We are experiencing a potential risk of similar setback at moment due to recent high and volatile food prices.
由于近期居高不下和不断波动的粮食价格，我们很可能遭遇类似的挫折。
3
Clearly today, these countries still face significant risks from high and volatile food prices, climate change and conflict.