back patching

• 1. 回插: back patching
• 2. 辅助发送和返回插座: Aux Send &Return Sockets
• 3. 交换机回路插口: switchboard loop jack

更多释义

• 1.它由地轮、传动销、传动拐臂、传动插杆、回位弹簧和传动棘轮组成。
  The utility model is composed of a land wheel, a driving pin, a driving crank arm, a driving inserted link, a release spring, and a driving ratchet.
  dict.yoduao.com

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