The optimeter is widely used to precisely measure external size of workpiece by comparison with a gauge block or standard part.

本仪器是一般是用标准器（）以比法测工件的尺寸。

Secondly, the structures of various multicouplers and their matching networks are introduced and discussed, and the design period of broadband matching network in multicoupler is presented in brief.

然后，本文对多多路耦合器的结构方案进行了分析和比，论了匹配网络的设计方法，其中简要讲述了宽带匹配网络的优化设计过程。