短寿命区采用四级恒定应力水平的成组试验法，长寿命区采用应力升降试验法。
The grouping test method at four constant stress levels was applied for short life span areas while the stress up and down test method were used for long life span areas.
短寿命区采用四级恒定应力水平的成组试验法，长寿命区采用应力升降试验法。
K... the grouping test method at four classes of constant stress levels was applied for short life-span areas while the stress up-and-down test method was used for long life-span areas.
并进行了对比试验，使用文中方法统计分析试验数据，发现单点法、单点-成组法及成组法测定出的P-S-N曲线较接近。
The comparative test was made, and the test data are analyzed and treated. It was found that the P S N curves determined by these three methods were approximate.
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