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 same basic population C0 had been selected for four cycles with Dominant male sterile wheat by means of the half-sib mating recurrent selection and the mass recurrent selection programmes.
以显性雄性不育小麦为材料，采用改良半姊妹和混合轮回选择两种方案，对同一基础群体C_0进行了四轮选择。
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