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颗粒材料的密度ρ、表观密度ρo。与堆积密度ρ′o之间，下列关系中何者是正确的( ) A: ρo＞ρ＞ρ′o B: ρ＞ρo＞ρ′o C: ρ′o＞ρo＞ρ D: ρ＞ρ′o＞ρo

一个长方形长a宽b,周长是（）面积是（）快!(#‵′)凸快!加速加速加速!今天就要!有急用!快!有急用啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)啊!(⊙o⊙)~~~~(>_____________________________________________________________________________________________________________________________________________________________

The combining forms for color red and black are ____________. A: erythr/o and melan/o B: erythr/o and leuk/o C: cyan/o and melan/o D: leuk/o and melan/o