This dissertation is the backbone of a PhD, and is the candidate' their research to others in their field .
论文是博士学位的主干，是重复训练读者与同一领域内的人交流重复训练的契机。
We also have designed and constructed over 40 basic machinery components factories which constitute the backbone of the field.
在机械基础件方面；由我院承担设计并建成投产的企业有40多家；
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