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【单选题】
Knowing that represents the critical stress of the slender column, which of the following statements is correct?
A.
is related to the critical load and the cross-sectional area of the column, and is independent of the material.
B.
is related to the s lenderness ratio of the column, and is independent of the cross-sectional area.
C.
is only related to the material, the shape and size of the cross-section of the column.
D.
The value of should not exceed the limit of proportional of the material.
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