In mass production, where mating parts must be interchangeable, unilateral tolerances are customary.
大规模生产中配合零件必须能互换，单向公差是经常遇到的。
The main equipment was imported from West German, Japan and Denmark, mating with the homemade equipment. We have complete production equipment and advanced technique flow.
主要设备引进于西德、日本、丹麦，与国内设备配套，生产设备齐全，工艺流程先进。
The milk and growth performance of low production Holstein herd had been improved after crossbreeding for 17 years and the rotational mating patterns made better improvement.
经过杂交，原中低产荷斯坦牛群体在产奶性能、生长性能方面都有进展，轮回杂交提高幅度相对略高。
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