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【单选题】
图示某工程基础平面布置图,在施工保证外墙基础受力钢筋贯通穿过,现场钢筋足尺按照9m考虑,则B轴线上 分布筋的下料长度说法中正确的是( ),保护层C=40mm。A.
有两种，短的分布筋下料长度是 5780mm ，长的分布筋下料长度是 12980mm
B.
只有一种，分布筋下料长度是 12980mm
C.
有两种，短的分布筋下料长度是 5780mm ，长的分布筋下料长度是 13130mm
D.
只有一种，分布筋下料长度是 13130mm
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A.
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B.
y =Acos{ ω [ t -( x-x 0 ) / u ]+ φ 0 }
C.
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A.
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B.
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C.
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D.
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