A short section on vacuum and its applications is followed by basic circuit information.

然后简要介绍了真空以及其应用，然后本书给出了一些基础的回路资料。

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The modern vacuum technology as a practical basic skill has been used more and more widely, because it can produce rare gas and clean environment.

近代真空技术作为一种实用的基础技术，由于它提供了稀薄的气体氛围和清洁的环境条件，获得了越来越广泛的应用。

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The basic principle of vacuum braze and its application in manufacturing gas chromatograph are described.

介绍了真空钎焊技术的基本原理及其在气相色谱仪气路部件加工中的应用。

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And virtual goods being devoid of legal status would provide no framework, and indeed a complete legal vacuum, in handling the most basic commercial disputes involving the purchase, sale or theft of such items.

FORBES: What Is The Legal Status Of Virtual Goods?

Unlike after the last election, however, a caretaker government is providing security and basic services and preventing a dangerous power vacuum from erupting.

WHITEHOUSE: Change of Command, End of Combat Operations Ceremony