The prestressed duct was a technical measure of duct grouting by vacuum method.
采用塑料波纹管作为预应力管道是配套真空辅助压浆技术的技术措施。
The present invention discloses a method for preparing a vinyl acetate catalyst by a vacuum method.
本发明提出了一种使用真空方法进行醋酸乙烯酯催化剂的制备 方法。
Objective: To investigate the application of high vacuum method in phacoemulsification and evaluate its effect.
前言：目的：探讨高负压在超声乳化手术中的应用，并对其效果进行评价。
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