硅芯管在人孔内余留长度不小于(),以便于气流敷设光缆时设备与塑料管连接。A. 100mm B. 200mmC. 300mm D. 400mm

作者: rantiku 人气: - 评论: 0
问题 硅芯管在人孔内余留长度不小于(),以便于气流敷设光缆时设备与塑料管连接。
选项 A. 100mm B. 200mm C. 300mm D. 400mm
答案 B
解析

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