题目内容

When the materials are the same, with the increase of working flexibility,

A. The critical pressure of slender rod decreases, and the critical pressure of medium thick rod remains unchanged
B. The critical pressure of slender rod remains unchanged, and the critical pressure of medium thick rod decreases
C. The critical pressure of slender rod decreases, and that of medium thick rod decreases
D. The critical pressure of slender rod remains unchanged, and that of medium thick rod remains unchanged

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The main reason for the instability of compression bar is the influence of external interference force

A. 对
B. 错

The compression bar made of the same material, the greater its flexibility, the easier to instability

A. 对
B. 错

The critical pressure of the compression bar is directly proportional to the elastic modulus of the material

A. 对
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Two compression bars with the same material, length, cross-sectional area and constraints must have the same critical force

A. 对
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