堆密度计算公式是()
A. ρ 0 ′ =m/v 0 ′
B. ρ =m/v
C. ρ 0 =m/v 0
D. ρ =m/v ′
大理石根据生成条件,按地质分类分,其属于()
A. 火成岩
B. 砾岩
C. 砂岩
D. 变质岩
A. Customerservice.
B. Productadvertising.
C. Newproducts.
D. Asalesplan.
We need to find a ______________ (knowledge) person to give us some advice on this matter.