The higher heating value decreases as the temperature increases and increases as the concentration increases.

产品气体的高热值随温度升高而减少，随浓度的增加而增加；

youdao

The higher heating value decreases as the temperature increases and increases as the concentration increases.

产品气体的高热值随温度升高而减少，随浓度的增加而增加；

youdao