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通过对血ⅢD试验6种参考油的四球试验，初步确定并验证了预测QE、QF级汽油机油通过ⅢD试验抗磨要求的四球试验条件及判断标准。
According to the four-ball test of 6 reference oils in blood ⅢD test, the test conditions and criteria of 4-ball test for predicting the wear resistance of QE and QF gasoline engine oil through ⅢD test were preliminarily determined and verified.