预防母婴传播服务的覆盖率相对较低(16%)。

Coverage of PMTCT services is relatively low - (16%).

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作者提出了一些不同的吸附模式，并报道了其相对的表面覆盖率。

The author proposes a number of different modes of absorption and reports their relative surface coverages.

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最后，利用TC正交数组为簇级测试产生覆盖率广、相对少的测试用例。

Finally, we use TC orthogonal array method to produce relatively fewer test cases with broaden coverage.

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