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

本仪器是一般是器（如量块）以比较法测量工件的尺寸。

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分析和比较，并讨论网络的设计方法，其中简要讲述宽带网络的优化设计过程。