both-way trunk circuit
... both-way opearrangementn 双向作业 both-way trunk circuit 双向中继器 both-way exchange line 双向用户线 ...
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电报中继器。可指定为单向单工、双向单工或双工运行。
Telegraph repeater. One-way simplex, two-way simplex, or duplex operation can be specified.
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