这是发生在第二次世界大战中期的一个真实故事。在战争中扮演了重要角色的美国空军,为了降落伞的安全性问题与其指定的降落伞制造商发生了一场纠纷。当时降落伞的安全性能不够,合格率较低。厂商采取了种种措施,使合格率提升到99.9%,但军方要求产品合格率必须达到100%。而厂商认为这是天方夜谭。他们一再强调:任何产品也不可能达到 This is a true story that took place in the middle of the Second World War. The U.S. Air Force, which has played a major role in the war, has a dispute with its designated parachute manufacturer on the safety of the parachute. Parachute safety was not enough at that time, pass rate is low. Manufacturers have taken various measures to improve the pass rate to 99.9%, but the military requirements of the product pass rate must reach 100%. And manufacturers think this is a fantasy. They have repeatedly emphasized that no product can be achieved