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一阶 bak 1X' D$ d; v6 Z" E# i% B
二阶 bak 1X > bak 2X/ h8 n" M2 [6 j/ M# h
三阶 bak 1X > bak 2X > bak 3X 8 t& _9 {! }1 p; }1 S四阶 bak 1X > bak 2X > bak 3X > bak 4X
5 k; Q' ^# L: [) J: i, a0 I2 f4 m5 _. m
+ a C. b+ }( S2 G' Q/ j3 S: [
一阶 bak 1X 0 n/ C; r; E$ E9 @ x4 d# |二阶 bak 1X > bak 2X6 b. E! X8 m3 l8 p
三阶 bak 1X > bak 2X > bak 3X2 x8 g7 d: L# e# [
四阶 bak 1X > bak 2X > bak 3X > bak 4X