短语词组短语Riser Distribution Cable 垂直分布式光缆Riser Interconnect Cable 干级线内部连接用光缆Ribbon Riser Cable 带状竖井线缆vertical riser cable 直升装置用电缆self -supporting riser cable 自承式提升型电缆electric cable riser 电缆立管 返回 riser cable