X1 ① X2 ② X2 ③ X2 ④ A X2 B X24 M6*13mm 1 X6 D C X30 E X6 F M6*35mm 2 E E E E E ① E A A C D ③ ④ ③ ④ ② ② ② ① 3 4 ④ B ③ D 80% A A 80% B D B D ③ ④ 5 6 100% E 100% A B D X1