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【单选题】
For an intermediate column, the critical pressure force F cr is obtained by using the Euler's formula in the stability calculation. Which is right in the following statements?A.
The critical pressure calculated by Euler’s formula is right.
B.
The real critical pressure> F cr , and the column is safe
C.
The real critical pressure< F cr , and the column is not safe
D.
The real critical pressure> F cr , and the column is not safe
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