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第二次世界大战中期,经过制造商的努力改进,美国空军降落伞的合格率达到99.9%,但军方要求达到100%。厂家一再强调,产品的合格率不能
In the middle of World War II, after the efforts of manufacturers to improve, the US Air Force parachute pass rate of 99.9%, but the military requirements of 100%. Manufacturers have repeatedly stressed that the passing rate of the product can not