- 搜標(biāo)題
- 搜題干
- 搜選項(xiàng)
單項(xiàng)選擇題
德士古推薦的水煤漿濃度為（）。
A.55%-65%
B.60%-70%
C.60%-65%
D.65%-70%
A.55%-65%
B.60%-70%
C.60%-65%
D.65%-70%
