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

本仪是一般是用标准（如量块）以比较法测量工件尺。

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.

，本文对多多路耦合构方案进行了分析和比较，并讨论了匹配网络设计方法，其中简要讲述了宽带匹配网络优化设计过程。