超星 - quiz-11 - 查题吧

单选题

The slender rod bears the axial pressure P, and the critical pressure Pcrit of the rod is independent of

A. Material of rod
B. the length of rod
C. Pressure on rod
D. Shape of rod

单选题

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

判断题

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

A. 对
B. 错

判断题

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

A. 对
B. 错

判断题

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

A. 对
B. 错

判断题

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

A. 对
B. 错

判断题

For axial compression members, because the normal stress on the cross section is evenly distributed, it is not necessary to consider the reasonable shape of the cross section

A. 对
B. 错

判断题

When the length of the slender compression bar is doubled and other conditions remain unchanged, the critical force becomes 1 / 4 of the original; If the length is halved, the critical force becomes 4 times of the original.

A. 对
B. 错

判断题

The compression bar meeting the strength does not necessarily meet the stability; The compression bar meeting the stability does not necessarily meet the strength

A. 对
B. 错

判断题

The stability of alloy steel must be better than that of carbon steel

A. 对
B. 错

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