正交表法
正交行数=素因数*(水平数-1)+1
l 行数(Runs)：正交表中的行的个数，即试验的次数，也是通过正交实验法设计的测试用例的个数
l 因素数(Factors)：正交表中列的个数，即要测试的功能点。
l 水平数(Levels)：任何单个因素能够取得的值的最大个数，即要测试功能点的输入值
附录1：常用正交表
n=k*(m-1)+1
n=行数 k=因素 m=水平数（1）
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(2)L8(27)
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(3)L12(211)
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（4）L9（34）
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（5）L16（45）
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（6）L25（56）
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（7）L8（4×24）
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（8）L12（3×24）
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（9）L16（44×23）
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