OK按键  OK

按键编码  Keyboard-coding

按键拨号  keydial; touch-tone dialing

按键波  keying wave

按键波形  push-button wave form

按键插入  switch insertion

按键处理(KBD)资源  keyboard resource

按键错误率  keying error rate; error rate of keying

按键打孔  keypunch

按键打孔机  key punch

按键单元  keying unit

按键电话  touch-tone telephone

按键电话机  push-button telephone set; KTU Key Telephone Unit

按键电话适配器  KTA Key Telephone Adapter; Key Telephone Adapters KTA

按键电话数据服务  touch-tone data service

按键电话系统  KTS Key Telephone System

按键电话装置  touch-tone device

按键电路  keying’ circuit; keying circuit

按键调变  key modulation