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【单选题】
某教学楼教室的主梁宽度为250mm,箍筋直径为10mm,下部纵向受力钢筋为一排4根直径25mm的HRB400级钢筋。纵向钢筋的净距为( )A.
20mm
B.
30mm
C.
40mm
D.
50mm
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【单选题】关于急性化脓性腹膜炎，下列哪项是正确的
A.
最常见的病原菌是金黄色葡萄球菌
B.
原发性，应早期手术治疗
C.
继发性的常见病因为急性阑尾炎穿孔
D.
诊断空腔脏器穿孔引起的急性腹膜炎，唯一依据是膈下游离气体
E.
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