我们对各地在地下管道方面所取得的经验进行了一次初步调查,总结以下几点,作为一个报导,供参考。一、灰土地下管道的发展概况在毛主席的革命路线指引下,自文化大革命以来,在农田水利建设上,涌现出许多 We conducted a preliminary survey of the experiences we have gained in underground pipelines and concluded the following points as a reference for reference. I. Overview of the Development of Limestone Underground Pipelines Under the guidance of Chairman Mao’s revolutionary line, many achievements have been made in the construction of farmland and water conservancy since the Cultural Revolution