举一反三
- To describe a force, we only need to describe the magnitude that describe "how hard" the force pushes or pulls.
- When calculating the displacement of composite structure: A: Only bending moment is considered B: Only axial force is considered C: Bending moment and shear force are considered D: Bending moment and axial force are considered
- The magnitude of the internal force of a bar depends on not only the external force but also the shape of its cross section. A: 正确 B: 错误
- After simplification of any force system in space, a force and a couple are obtained. The magnitude of this force is ( ) the principal vector of the force system. A: equal to B: more than C: less than D: not equal to
- The internal forces in a thin plate under bending deformation include: A: bending moment B: twisting moment C: shear force D: axial force
内容
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The flexure formula is based on the requirement that the ( ) on the cross section is equal to the ( ) produced by the ( ) distribution about the neutral axis.? resultant moment; moment; linear normal stress|resultant moment; moment; nonlinear normal stress|resultant moment; moment; nonlinear shear stress|resultant normal force; force; linear normal stress
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2(marks 3). Which of the following is an incorrect statement. A: The product moment correlation coefficient can be used with non-numeric data. B: The product moment correlation coefficient is the definitive measure of correlation. C: The rank correlation coefficient can be used as an approximation to the product moment coefficient. D: The rank correlation coefficient can be used with non-numeric data .
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Pearson’s product moment correlation coefficient 可用来判断：
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There are two point-charges<br/>q1<br/>and q2.<br/>The magnitude of electric field force between them is F. If the third<br/>point charge +Q is<br/>introduced, will the force between q1<br/>and q2<br/>be influenced by +Q<br/>[ ] A: It will not be influenced by +Q B: It will be influenced by +Q
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At the moment we are looking for a new brand name that suggests something about the product's benefits and ________. A: qualities B: development C: image D: loyalty