A.正确 B.错误
A.3 B.4 C.5 D.10
A.①-②-③-④-⑤-⑥-⑦-⑧ B.④-②-③-①-⑤-⑥-⑦-⑧ C.②-⑤-③-④-①-⑥-⑦-⑧ D.①-②-④-⑤-③-⑥-⑦-⑧
A.0.5 B.1 C.5 D.20