单项选择题
A.0.2 B.0.3 C.0.5 D.1.0
A.0.05~0.1 B.0.1~0.2 C.0.15~0.2 D.0.2~0.5
A.<﹣70℃ B.<﹣60℃ C.<﹣55℃ D.<﹣40℃