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【单选题】
相对于钢桁，钢板的特点是A.
构造简单、造价低
B.
跨度大
C.
抗扭刚度大
D.
局部稳定性好
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【简答题】Hello! My name’s Lin Min. My sister Lin Li is a teacher ( 教师 ), but she isn’t in Beijing with us. She works in a small school in Yushu in Qinghai. She works hard . Every morning after breakfast, she g...
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