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2、5 s 2 1 5 (2 5) 2 (3 5) 2 (7 5) 2 (8 5) 2 (5 5) 2 26 5 . 7 ) XmYn m n(m n m n _ 20 63 m n m n (m n) 63( ) m n 20( ) P 20 63 . 8 ) 60 ( cm) 80,130 20 6 60 _ 100 cm. 20 6 24 80,90) 0.15 90,100) 0.25 60 100 cm (0.15 24. 9 150 450 1 000 1 000 ( 20 7) 300,350) _ 20 7 300 1 50(0.001 0.001 0.004 a 0.005 0.
3、003) 1 a 0.006. 300,350) 300. 10 20 (10,20 2 (20,30 3 3 (30,40 4 (40,50 5 (50,60 4 (60,70 2. (10,50 _ 7 10 (10,50 2 3 4 5 14 (10,50 14 20 7 10 . (10,50 4 2 6 (10,50 1 6 20 7 10 . 11 160 20 160 1 160 20 (1 8 9 16 153 160 ) 16 126 _ 6 x x 8 16 126 x 126 x 6. 6. 12 A 1,2,3,4 B 5,6,7,8 _ 3 4 16 1,6 1,8
4、3,6 3,8 2,5 2,6 2,7 2,8 4,5 4,6 4,7 4,8 12 P 12 16 3 4 . 13 ) 2 1 _ 19592061 8 9 9 P 1 1 9 8 9 . 20 8 14 ) 20 8 5 ( ) _ 2 x 88 89 90 91 92 5 90. 4 x 87 89 90 91 93 5 90. s 2 1 5 (88 90) 2 (89 90) 2 (90 90) 2 (91 90) 2 (92 90) 2 1 5 (4 1 0 1 4) 2. s 2 1 5 (87 90) 2 (89 90) 2 (90 90) 2 (91 90) 2 (93 90) 2 1 5 (9 1 0 1 9) 4. s 2 s 2 . 15 ) 2 2 _ 1 3 2 A1 A2,2 B1 B2 A1A2 A1B1 A1B2 A2B1 A2B2 B1B2 A2A1 B1A1 B2A1 B1A2 B2A2 B2B1 12 A1B1 A1B2 A2B1 A2B2 4 P 4 12 1 3 . 16 60 ( ) 40,50) 50,60) 90,100 20 9 _ 20 9 71 0.1 0.15 0.15,0.3,0.25,0.05 45,55,65,75,85,95. x 71.