number of friction pairs

• 摩擦副

number of friction pairs的用法和样例：

例句

1. Secondly, the performance of friction couples are tested under the condition of USM running.
   接着在电机运转的条件下，对耐磨材料组成的摩擦副的表现进行评价和优选。
2. Results show that effect of temperature should not be neglected in researching the lubrication of cam-tappet pairs.
   在对此类摩擦副进行润滑研究时，不能忽略温度因素的影响。