例句與造句

1. TXE6 was an electronic common control exchange that was designed to extend Strowger exchanges, and known as the Electronic Reed Selector System or Reed Group Selector ( RGS ).
2. During the 1970s, common control exchanges became stored program control exchanges, using in the 1980s common-channel signaling in which the channels that are used for signaling are not used for message traffic.
3. It's difficult to find common control exchange in a sentence. 用common control exchange造句挺難的