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建设部于1999年4月2日在成都市对四川建筑机械厂开发研制的M900塔式起重机进行技术鉴定。来自全国的建筑机械科研院、所，大专院校、用户及政府主管部门的10多位专家、教授出席了鉴定会。通过到会专家、教授对M只刀塔式起重机的软件资料仔细审查和对样机的现场测试以及对四川建
Ministry of Construction on April 2, 1999 in Chengdu, Sichuan Construction Machinery Factory developed M900 tower cranes for technical appraisal. More than 10 experts and professors from construction machinery research institutes, institutes, universities, users and government departments in China attended the conference. By experts to be met, the professor of M knife turret crane software information carefully reviewed and on-site testing of the prototype and construction of Sichuan