3）以平衡线及操作线作理论梯级：x?*y??（??1）y?y2.50?1.50y?3?????（1）?????（2）y?1.685x?1.369?10计算理论梯级顺序与数据如下：（y1?xD?0.36）???（x1?0.1837）???（y2?0.3083）???（x2?0.1512）???(y3?0.2534)???(x3?0.1195)(y4?0.2000)(x5?0.06630)???(2)(1)(2)(2)(1)（1）（2）（1）???(1)(2)(x4?0.09091)???(y5?0.1518)??????(x6?0.04766)??????(y8?0.05449)??????(x9?0.01496)???(2)(1)(1)(2)(2)(1)(1)(2)???(y6?0.1112)(1)(y7?0.07894)???(x7?0.03315)(x8?0.02253)???(y9?0.03659)(1)(2)(y10?0.02384)???(x10?0.009674)???(y11?0.01493)???(x11?0.006026)???(y12?0.008785)???(x12?0.003533)???(y13?0.004584)???(x13?0.001839)(1)(2)(1)(2)
?NT?12?(3.533?23.533?1.839)?12.9块