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【单选题】
一座二级耐火的三层办公楼，只设一座楼梯的必要条件是下列中哪两条( )Ⅰ．每层建筑面积不大于200㎡；Ⅱ．每层建筑面积不大于500㎡；Ⅲ．二、三层人数之和不超过50人；Ⅳ．二、三层人数之和不超过100人。A.
Ⅰ、Ⅲ
B.
Ⅰ、Ⅳ
C.
Ⅱ、Ⅲ
D.
Ⅱ、Ⅳ
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