international sea-bed area
bed cross-sectional area
coal bed methane in coal mine area
coal bed methane(CBM) enrichment area
area, area side trapezoid
wetted surface area [= area of wetted surface]
monolithic track bed；solid bed；integrated ballast bed；monolithic concrete bed
annual temperature difference between track bed slab and bed plate
Circulating fluidized bed wity low velocity fore postied branch bed