resistance per unit length

例句：

1. 1. The resistanceof the material to heat is a criticalfactor in its performance.
   材料对热的阻力是其性能的关键因素。
2. 2. The resistanceper unit length of the wire is measuredby using a resistance meter.
   通过使用电阻计测量导线的单位长度电阻。
3. 3.The resistance per unit length of the circuitincreases as the voltage increases.
   电路的单位长度电阻随着电压的增加而增加。