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选择题：试说明通信线路工程中,哪些情况下应埋设光、电缆标石?
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通信工程中,对光、电缆埋设标有哪些要求?
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His decades of effort began to__________ , for his new breed of rice had become m
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铁路通信光、电缆施工存在哪些常用防护情况?
铁路通信光、电缆施工存在哪些常用防护情况?