应用函数列的极限与函数的极限交换次序定理，研究了二元函数的二重极限与它的两个累次极限的关系定理，研究了二元函数的两个二阶混合偏导数可交换次序定理。
By using the limits of functions and the exchange limit theorem, we considered the relationship between the double limit of function with two variables and its repeated limits.
给出了一种代数法交换积分次序的方法，避免了作积分区域图的麻烦。
The article introduces a method in which the order of quadratic integral can be exchanged with the knowledge of elementary.
由于XOR运算具有交换性和结合性，无论日志记录生成的次序如何都可获得正确的恢复。
Since XOR operations are commutative and associative, correct recovery is possible regardless of the creation sequence of log records.
由于XOR运算具有交换性和结合性，无论日志记录生成的次序如何都可获得正确的恢复。
Since XOR operations are commutative and associative, correct recovery is possible regardless of the creation sequence of log records.
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