Ntsia hlau pawg
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Ntsia hlau pawg rau kev tsim lub hauv paus tob
Screw piles yog steel ntsia hlau-hauv piling thiab hauv av anchoring system siv los tsim cov hauv paus tob.Screw piles yog tsim los siv ntau qhov ntau thiab tsawg ntawm tubular hollow seem rau pawg lossis anchors ncej.
