A.Ⅰ B.Ⅱ C.Ⅲ D.以上都不是
A.N+2 B.N+1 C.N+1或N+2 D.N+1和N+2
A.0.9、0.6、0.8 B.0.6、0.8、0.9 C.0.9、0.8、0.6 D.0.8、0.9、0.6