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1·Optimal calculation of definite integral can be obtained by combination of the odevity of function and the symmetry of integral domain.

定积分的计算是高等数学的重要内容之一，但在积分计算时可以结合积分区域的对称性和被积函数的奇偶性来简化计算。

2·The patients were divided into experimental group and control group randomly according to the odevity of the last number of the ID number, and each group has 20 cases.

所有病例按照其住院号末位数的奇偶数随机分为对照组及实验组，每组20例。