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。

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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。

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Objective To explore the relationship of the mean color vessels density (MCVD) with TNM stage and pathologic microvessel density (MVD) in rectal cancers.

目的探讨直肠癌彩色血流平均密度(MCVD)与TNM分期、微血管密度(MVD)的关系。

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