I have eggplant and _____________ for dinner today. [ ]
A. tomato
B. tomatos
C. tomatoes
答案:C
会计电算化培训分为()个层次。
A.两个
B.三个
C.四个
D.五个
某硫化铜矿浮选厂,已知原矿品位α=1.23%Cu,精矿品位β=22.18%Cu,尾矿品位δ=0.04%Cu,求铜精矿理论产率γ理?