单项选择题
A.120mm B.150mm C.180mm D.200mm
A.Ⅰ、Ⅱ、Ⅲ B.Ⅰ、Ⅲ、Ⅳ C.Ⅰ、Ⅱ、Ⅳ D.Ⅱ、Ⅲ、Ⅳ
A.100mm B.150mm C.200mm D.250mm