使用因素 meaning in English

service factor
use factor

Useful factors affecting on start of diesel engine
影响柴油机启动的使用因素探析
Analysis of factors that influence working life of screw drill
影响螺杆钻具工作寿命的使用因素分析
Influence of practical complications on lubrication of main journal bearings in multi - cylinders ice
使用因素对多缸内燃机主轴承润滑的影响
The research of controlled usage factors on influence degree to the productivity of little tonnage truck ' s transportation
可控使用因素对小吨位货车运输生产率影响程度的研究