Exchange of unequal values makes the poor countries poorer.

不等价交换使穷国更穷。

Starting with Lagrange equations of the first kind, pure differential equations of multibody systems with rheonomic constraints are established.

根据变换方程与约束方程显含时间的等价性，提了定常约束与定常系统判据的等同表。

It also discusses some properties of homology regular morphism, and its close relationships to homology monomorphism (epimorphism) and homology equivalence.

了同调正则态射的一些性质，以及它与同调单（满）态和同调等价之间的关系。

This paper andlyses and disscusses the application of group of equal value in syn-thetize to the synthetize of carbonyl chemical compound.

本文介绍并讨论了某些合用等价基团在合羰基化合物中的应用。

In this paper by applying the poloidal-toroidal decomposition of a velocity field, Oberbeck-Boussinesq equations are transformed into a new equivalent system.

本文利用速度场的poloidal-toroidal分解，把Oberbeck-Boussinesq方程组转化为一个等价的方程组。

Rates or special bookings such as leaflet insertion, advertorial is available by quotation. Any confirmed bookings are not allowed to cancel.

广告客户之预订经确认后,不得取消。其规格如插页、宣传稿等价目,可向本刊查询。

By using the equivalent model,contact force of ideal trochoid transmission was calculated,and the calculation result agree relatively well with a theoretical one.

利用质量弹簧等价模型方法计算了理想结构下摆线针轮传动的齿面载荷分布。

Considering the subnormal subgroups,some equivalent conditions for nilpotency of finite groups are given and a sufficient condition for nilpotency of finite groups is obtained.

研究次正规子群对有限群结构的影响,得到幂零群的若干等价条件和一个充分条件。

This paper presents an approximate analytic method for the stiffened torispherical shell with opening under uniform external pressure, that is, the equivalent spherical shell method.

本文提一种外压作用下开孔加筋碟形薄壳屈曲的近似分析方法──等价球壳方法。

According to the theory of scalar diffraction, first, the equipollence of spatial distribution of the plane-wave interferential field and parallel projective sine grating is discussed.

摘要根据标量衍射理论，首先讨论了两平面波干涉场的空间分布与平行投影正弦光栅的等价性。

In this paper, we proved that the definition of a semilattice as a universal algebra and the definition of a semilattice as a partial ordered set are equivalent.

本文中，我们证明了作为泛代数的半格的定义与作为偏序集的半格的定义是等价的。