单项选择题
A.1545.52 B.1632.79 C.2081.81 D.3146.31
A.①②④,③⑤⑥ B.①③④,②⑤⑥ C.①③⑤,②④⑥ D.①②⑤,③④⑥
A.121.90 B.116.71 C.100.48 D.131.85