单项选择题
A.Mc1a-1/Mc1a-8,49.DC柜B.M2-3/M2-6,42DC柜C.Md2-5,44.DC柜D.Tp-2/Tp-7,42.DC柜
A.3B.5C.10D.15
A.门扇B.翻版C.门扇和翻板D.供风截断塞门