https://www.cnblogs.com/gisen_6/p/3708201.html
(1)L4(23)
(2)L8(27)
(3)L9(34)
(4)L12(211)
(5)L16(45)
(6)L25(56)
(7)L8(4×24),即:L8(41×24)
(8)L12(3×24),即:L12(31×24)
(9)L16(44×23)
3 因素4水平正交表