选择题：混凝土保护层厚度是指：（　　）(A)纵向受力钢筋的外边缘至混凝土表面的垂直距离(B)箍筋外表面至

题目内容：

混凝土保护层厚度是指：（　　）
(A)纵向受力钢筋的外边缘至混凝土表面的垂直距离
(B)箍筋外表面至混凝土表面的垂直距离
(C)受力钢筋形心至混凝土表面的垂直距离
(D)受力钢筋合力点至混凝土表面的垂直距离

参考答案：

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