The productivity of SMF is restricted by several factors with traditional MCVD process.
以传统的MCVD工艺生产单模光纤，生产率受到限制。
2
Based on the knowledge of producing optical fiber preform, MCVD process was selected as the main research object.
在了解光纤预制棒加工工艺的基础上，选择M CVD法为研究对象。
3
Objective To explore the relationship of the mean color vessels density (MCVD) with TNM stage and pathologic microvessel density (MVD) in rectal cancers.