皮皮学，免费搜题
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【单选题】
将圆截面压杆改为面积相等的圆环截面压杆,其它条件不变,则其柔度将( )。A.
增大
B.
降低
C.
不变
D.
无法确定
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皮皮学刷刷变学霸
举一反三
【单选题】— Well, that was really a good meal. I _____ you were a really good cook. — Thank you.
A.
didn’t know
B.
don’t know
C.
haven’t known
D.
hadn’t known
【单选题】—Well, that was really a good meal. I _______ you were a really good cook. —Thank you.
A.
didn’t know
B.
don’t know
C.
haven’t know
D.
hadn’t known
【简答题】计算博学楼本班教室门前柱块料面层工程量
【简答题】cook a thank-you _____ ;
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