短語詞組短語single wire line 單線線路single -line Network 單線網(wǎng)絡(luò)single conductor line 單芯電纜single hand line 單鉤手釣repeater single -line 單線轉(zhuǎn)發(fā)器single in line 單邊引出線single pipe line 單流水線 返回 single line