When transformation of parts of speech takes place, we should distinguish synchronism from diachronism, grammar from rhetoric anti fixity from temporariness.

摘要转类，分历时和共时、语法和修辞学、固定和临时。

This paper introduces the principles of the vibroplatform,provides some methods for the detection and diagnosis of the servo valve,and makes the field monitoring of the synchronism of vibroplatform.

对振动台原理作了简要介绍,给出了伺检测诊断方法,并对振动台同步进行了现场监测。