梁集中标注第二行标注“Ф 8A100/200 ( 2 ); 4 B 25 ; 4 B 22 ” ,其中 4 B 25 表示( )。
A.
架立筋
B.
上部通长筋
C.
下部纵筋
D.
构造筋
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参考答案:
举一反三
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