密封的选用在很大程度上直接影响其使用寿命。
Selection of seal will affect the usage life of seal in great degree.
钢丝绳捻制质量是影响其使用寿命和承载能力的主要因素。
The laying quality of wire rope is a main factor to affect its service life and load bearing capability.
PD C钻头的涡动是影响其使用寿命和效果的主要原因之一。
The whirling is one of the main reasons of decreasing the life and the useful effect of PDC bits.
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