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2、 (41) (42) (43) (44) 6.83。2 (45) 101 (46) 15 (47)88(48) (49)( 90) (50)+(51)+ (52)18(+)(53)7+5 (54)()(24)(55)(+) (56)(+)(57) (58)3 (59) (60) (61) (3217) (62)(25) (63) (64) (65) (66) (2121) (67)(99)9 (68) () (69)()30 (70) (71) 5841(72) (73) (74) () (75) 153 0.653 (76)() (77)() (78) ()1511 (79) (80) 46 (81) 2008 (82) (83) (84)36 (85) (86) 101 (87) (88) (89)17