１９９４年，海山５７２１工厂严重亏损，濒临破产，沦为空军航空修理系统最困难的工厂之一。经过七年改革发展，该厂走出困境，踏上中兴大道。其中的奥秘在哪里？就在于该厂精心培育和提炼出的“自加压力求发展、自行转轨搞改革、自找市场上规模、自强发展创大业”的“四自” In 1994, the seamount 5721 factory suffered a serious loss and was on the brink of bankruptcy, becoming one of the most difficult factories in the Air Force's aviation repair system. After seven years of reform and development, the plant out of the woods, set foot on ZTE Avenue. Where is the mystery? It lies in the plant carefully cultivated and refined out of “self-imposed pressure to develop self-transition reform, find the market size, self-development and development” of the “four since”