问题
选择题
Mrs. Green is a(n)_______ woman. She hardly ever smiles. [ ]
A. friendly
B. serious
C. athletic
D. smart
答案
答案：B
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Mrs. Green is a(n)_______ woman. She hardly ever smiles. [ ]
A. friendly
B. serious
C. athletic
D. smart
答案：B
，fy=300N／mm2）级钢筋。计算时取as=as′=35mm。