权威例句
High density concrete placerSwivel arm concrete placerCONCRETE PLACERThe CWS-200 combines Diamond Chain Technology with a mechanized, track-mounted hydraulic power drive.Hydraulic Concrete Placer Keeps Airport Project Flying Rightconcrete placerConcrete placer tool including octagonal pole handleProductivity Aspects of Concrete Boom Placer in Hyderabad Metro RailOccupational safety in use of hydraulic concrete placersStrike-off beam and spreader plow assembly for placer/spreader