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³³ƮӰԺ,Ưav,caomama

lrg2019-11-14

_ڹ̵ccgȣ_ڼg^ֵ]20У_ڼgoՓՓϣ߀ʩˇ棬ͻwMİlչ_ڼgǘOҪҼNOܵʩֶΣ÷_ڼgOֵܵ쪚ăݡCompared with other technologies, trenchless technology starts late. However, it is worth noting that in the past 20 years, trenchless technology has developed by leaps and bounds in both theory and construction technology. Trenchless technology is a very important construction method for laying pipelines in cities.

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