题目内容

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)

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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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下列关于平衡移动的说法中,正确的是** ( )

A. 平衡移动是指反应从不平衡到平衡的过程
B. 增大压力总是使平衡从分子数多的一方向分子数少的一方移动
C. 在平衡移动时,KΘ 总是保持不变的
D. 若反应Δ H > 0,则ΔS > 0还是ΔS < 0 ,升温时平衡总是正向移动

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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 （ ）.

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*

下列关于平衡移动的说法中,正确的是** ( )

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 （）.