“digital hierarchy”可以造什么句，digital hierarchy造句

2、Frame structure for synchronous digital hierarchy signal

4、Specifications for synchronous digital hierarchy (SDH) multiplex equipment

6、Temporary regulation for design of synchronous digital hierarchy(SDH)microwave relay telecommunication system engineering

1、Synchronous digital hierarchy bit rates

5、Requirements for synchronous digital hierarchy (SDH) optical fiber cable line systems of national public telecommunication network

3、Basic multiplexing structure for synchronous digital hierarchy signals

7、Methods of measurement for synchronous digital hierarchy(SDH)optical fiber cable line systems