对流条件(Concurrent Condi-tion)或称共存条件指双方当事人须同时履行各自的义务即一方的义务履行与对方的义务履行互为条件例如在买卖合同中如合同对卖方交货和买方付款的时间没有具体规定则按某些国家的法律卖方交货与买方付款是对流条件买卖双方应同时履行各自的义务如卖方不交货买方即无付款义务反之如买方不付款卖方亦无交货义务
...民法所确认的重要的合同履行规则，在英美法国家则采用了一个与同时履行抗辩权极其相似的概念“对流条件”(concurrent condition)，来维护合同在履行上的安全与平衡。
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... conciliation 调解 concurrent terms 对流条件 conditional sale lease 销售租赁 ...
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... mutuality of consideration对价的互惠 concuring opinion对流条件 as is 以现状为准 ...
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对流边界条件 convection boundary condition
在以上流场计算的基础上，耦合计算浓度场的子程序，计算了自然对流条件下受限空间内有污染源存在时的非稳态浓度场。
Unstable concentration field in the condition of unforced convection in the confined vacuum has been calculated by programming flow field and concentration field simultaneously.
可以很好地用来判断现有裂解炉对流段对改变原料和操作条件的适应性和设计各种规模和适应各种原料的裂解炉。
It can be used to check the flexibility of the convection section when the feed and operation condition changes, and it can be used to design the cracking furnace of different scale and feedstocks.
应用交替分段显隐方法求解变系数对流扩散方程，此方法具有很好的并行性且无条件稳定。
Using alternating segment explicit implicit method for the variable coefficient convection diffusion equation. The method has the obvious property of parallelism and is unconditionally stable.
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