Two kinds of four ball test methods are discussed. It proved that the rotation speed is the primary factor effected on results.
通过对两种四球试验法的讨论，证明转速是影响试验结果的主要因素。
Two kinds of four ball test methods are discussed. It proved that the rotation speed is the primary factor effected on results.
通过对两种四球试验法的讨论，证明转速是影响试验结果的主要因素。
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