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An actual truss has only axial forces, no bending moments and shear forces.

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The rational axial line of a three-hinged arch under downward vertical uniformly distributed load is （）.

A. Second-degree parabola (二次抛物线)
B. Catenary (悬链线)
C. Hyperbola (双曲线)
D. Cosine curve (余弦曲线)

When establish a virtual work equation, the relationship between force state and displacement state is （）.

A. Independent of each other
B. The displacement state must be generated by the force state.
C. Mutual causation
D. The force state must be caused by the displacement state.

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The internal force of any structure is zero if it is not subjected to external loads.

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已知：φΘ(Fe3+ / Fe2+) ＝ +0.77 v， Ksp(Fe(OH)3)＝ 4.0×10－38，Ksp(Fe(OH)2)＝ 8.0×10-16则φΘ(Fe(OH)3 / Fe(OH)2) 值是*

A. -0.55 v
B. +O.55 v
C. -0.31 v
D. +0.31 v

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An actual truss has only axial forces, no bending moments and shear forces.

The rational axial line of a three-hinged arch under downward vertical uniformly distributed load is （ ）.

When establish a virtual work equation, the relationship between force state and displacement state is （ ）.

The internal force of any structure is zero if it is not subjected to external loads.

已知：φΘ(Fe3+ / Fe2+) ＝ +0.77 v， Ksp(Fe(OH)3)＝ 4.0×10－38，Ksp(Fe(OH)2)＝ 8.0×10-16则φΘ(Fe(OH)3 / Fe(OH)2) 值是*

The rational axial line of a three-hinged arch under downward vertical uniformly distributed load is （）.

When establish a virtual work equation, the relationship between force state and displacement state is （）.