coefficient of heat efficiency

例句：

1. 1.The coefficient of friction between the two surfaces is 0.3.
   两个表面之间的摩擦系数是0.3。
2. 2. The coefficient of heat efficiency is a measure of how much energy is lost in a process.
   热效率系数是一个衡量过程中能量损失的指标。
3. 3. The coefficient of thermal conductivity determines how quickly heat can move through amaterial.
   热导率系数决定了热量如何通过材料移动。