A.①一④,②一⑥,③一⑤ B.①一⑤,②一⑥,③一④ c.①一⑥,②一④,③一⑤ D.①一⑥,②一⑤,③一④
A.0.5MPa B.O.6MPa C.0.7MPa D.0.8MPa
A.①③④ B.①②③ C.②③④ D.①②③④