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
ebullated bed ebullating bed
ebullated bed reactor ebullating bed reactor
ebullating bed ebullated bed
ebullating bed reactor ebullated bed reactor
moving packed bed and fluid bed
1-D band-limited Weierstrass fractal rough surface
1D exponential rough soil surface
2-D fractal rough surface
3-D random rough surface
a Covering Generalized Rough Set