gravity haulage
自重水力运输 gravity hydraulic transport
自行式重型运输车 self-propelled heavy transport vehicle
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传统的镀锌钢管和普通排水铸铁管由于易锈蚀、自重大、运输施工不便等原因已逐渐被取代。
The traditional galvanized steel tube and ordinary drainage iron pipe due to easy to rust, since the major, transportation construction inconvenience of reason has gradually be replaced.
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