齿面磨损量
abrasion value of tooth surfaces
硬齿面齿轮
hard tooth surface gears
hard tooth surface gear
hardened face gear
surface hardened gear
JRTR gear
hardened gear
Case-hardened Gear
gear with hardened surface
表面两性结构
facial amphiphilic structure
仿麂皮呢正反穿两面用大衣
wool suede and rayon faille reversible coat
渐近两两NQD
asymptotically NQD sequence
均数两两比较
Comparison of every two means