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pipeline valve
管道阀门
油气管道系统中用于控制油(成品油、原油)、天然气等各种类型流体介质流动的元件。
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Rontgen ray
Rontgen rays
Rood-Sastry classification
Rood-Sastry system
Rood-Sastry type
roof
roof and floor
roof and floor of wood frame construction
roof-angle prism
roof fall
roof garden
roof greening
roofing beam
roofing engineering
roof iris
Roofloy
roof of coal seam
roof planting
roof prism
roof-ridge decorative animal sculptures
roof strata collapse of working face
Roof Tile With Monster-mask
Rooftop
roof top reflector
roof truss
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