单项选择题
A.0.1mm,0.1g B.1mm,1g C.0.1cm,0.1g D.1cm,1g
A.横肋之间 B.纵肋之间 C.横肋与纵肋之间 D.无要求
A.19.05 B.19.0 C.19.1 D.19