齿面磨损量
abrasion value of tooth surfaces
硬齿面齿轮
JRTR gear
hard tooth surface gears
hard tooth surface gear
hardened gear
surface hardened gear
Case-hardened Gear
hardened face 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