【单选题】
承重结构的钢材宜采用Q235钢.Q390钢.___.Q420钢。
A. Q345钢
B. Q195钢
C. Q275钢
D. Q215钢
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答案
A
解析
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B. 堆积密度>密度>表观密度
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D. 堆积密度>表观密度>密度
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