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【单选题】
压杆属于细长杆、中长杆还是短粗杆,是根据压杆的(  )来判断的。
A.
柔度
B.
横截面尺寸
C.
临界应力
D.
长度
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A.
光线
B.
承影面
C.
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D.
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A.
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B.
2
C.
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D.
4
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A.
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B.
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C.
储存
D.
控制
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