某吸收塔中,物系的平衡线方程为y=2.0x,操作线方程为y=3.5x+0.001,当y 1  =0.06,y 2 =0.0020 时,x 1 =_______,x 2 =_____________,L/V=______,气相传质单元数N 0G =_______