A.①④⑥,②③⑤ B.①③④,②⑤⑥ C.①③⑤,②④⑥ D.①②③,④⑤⑥
A.①②④,③⑤⑥ B.①②⑥,③④⑤ C.①⑤⑥,②③④ D.①④⑤,②③⑥
A.600 B.800 C.1000 D.1200
A.61% B.63% C.67% D.69%