单项选择题
A.0.5~2.0 B.1.5~2.0 C.1.5~2.5 D.1.0~2.0
A.30; B.35; C.40; D.45
A.0.5 0.7 1.0 B.0.5 0.8 1.0 C.0.5 0.8 2.0 D.0.8 0.8 2.0