本文对影响数控机床可靠性的几个因素进行了讨论，并且从机械和电气两方面提出了改进的方法。

This paper discusses several influence elements of reliability of Numerical Control machine, and presents improvement methods from machinery and electricity.

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本文从体外产气法的原理、影响体外产气量的因素、体外产气试验的可靠性以及体外产气法的应用和改进等几个方面作了评述。

This review explicated in vitro gas production technique, including its theory, the factors that affect the quantity of in vitro gas production, credibility of tests, application and improvement etc.

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