Symmetry can also improve the efficiency of technology of mapping and equivalence testing.

使用对称也可以提高映像技术和等价检测的有效性。

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In a certain hydrogen flux, there exists the highest combustion efficiency near to the complete combustion equivalence ratio, and the combustion efficiency about 100%.

在氢气流量一定时，燃烧效率在完全燃烧当量比附近存在峰值，最高燃烧效率接近100%。

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Absrtact: the optimization choice of test case in regression testing is one of the key steps. Advance the efficiency of testing via equivalence partitioning method belonging to black box testing.

摘要：回归测试中测试用例的优化选择是个关键环节，借助黑盒测试中的等价类划分选择测试用例可以提高测试的效率。

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