超滤液清洗中泵流量为槽有效容积的（）倍。
A、1-2
B、2-3
C、3-4
D、4-5
参考答案：B
_______ the children grew old, they became more and more _______ in science.
A．As; interested
B．With; interesting
C．While; interest
D．With; interested
说明曲面刮线的方法和注意事项？
