义词Starting with Lagrange equations of the first kind, pure differential equations of multibody systems with rheonomic constraints are established.
根据变换方
与约束方显含时间的
价性，提出了定常约束与定常系统判据的同表述。
(
)Starting with Lagrange equations of the first kind, pure differential equations of multibody systems with rheonomic constraints are established.
根据变换方与约束方显含时间的价性，提出了定常约束与定常系统判据的同表述。
Axisymmetric elasticity problem of cubic quasicrystal is reduced to a solution of a partial differential equation with higher-order by introducing displacement function.
本文通过引入位移函数使得立方准晶的轴对称弹性问题化为求解一高阶偏微分方。
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