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1.2.9有限的平衡对于一个拥有N种反应物，L种元素的K反应系统来说，如果 N＝K+L 1.2.45等式成立，显而易见，根据等式1.2.43以及1.2.44经过合并简化，就可以通过K+L确定N种物质，且具有唯一性。如果N大于K+L，系统反应不完全，且具有不稳定性。然而，通常情况是更多的反应类型是N小于K+L的。此种情况下，有必要根据K系统的等式构建一组等价的K'小于K的等式，比如N＝K'+L。举个例子，假设氢气与氧气之间发生如下化学反应：……此时我们定义L＝2（氧元素和氢元素），N＝6（氢气，氧气，水，氢元素，氧元素及氢氧根离子），K＝5，显然N小于K+L。为了减少反应的数量，首先我们写出反应的系数矩阵如下：……上述矩阵并不是满秩的。但是我们很容易将其合并为一类4阶矩阵，如下 ：……于是，一种等效的反应模式，即K'＝4，如下所示：……根据元素守恒我们得出：……上述系统中，NO.0与NH.0分别对应混合物中氧气与氢气的摩尔数。因此得出N＝K'+L。 水平有限，希望有帮助。
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机械专业Mechanical major；Mechanical英 [məˈkænɪkl] 美 [mɪˈkænɪkəl]adj. 机械的，机械学的; 呆板的; 体力的; 手工操作的;双语例句1. The company undertakes mechanical work on all types of cars.该公司承接各类汽车的修理工作。2. He was a very mechanical person, who knew a lot about sound.他精通机械，了解许多有关声音的知识。3. Stress, both human and mechanical, may also be a contributing factor.来自人的和机械方面的压力可能也是一个因素
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Machine is an artificial combination of physical components. Between the various parts of machinery to determine the relative motion. The machine has the characteristics of institutions, but also must have the third characteristic that is able to replace human labor in order to complete a useful mechanical work or conversion of mechanical energy, so the machine can be useful to convert mechanical energy or completed on behalf of the mechanical principle of the basic concepts, the Chinese Mechanical The modern concept of the multi-Japanese from the "mechanical" in Japan's mechanical engineering of the machine to make the following definition of the concept ofMachinery is a combination of objects, assuming that power added to the deformation of its parts is difficult.These objects have to each other, and a single to put the energy into the most useful form, or converted into an effective mechanical
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