通断

• make-and-break

参考释义

通断 [tōng duàn]

• -
• 短语
  通断按键 tapping key
  通断比 break-make ratio
  通断开关 cut-in out switch; on and off switch; on-off switch; switch on and off
  通断操作 make-break operation
  通断控制 on-off control
  通断调制 on-off modulation
  通断装置 on-off system