切实为行业实现“两个根本性转变”做好服务工作——在中凿协会第四届会员代表大会上的书面讲话（１９９７年７月２３日）张玉成各位领导和与会代表同志们：由于参加机械部机械产品质量监督检测中心主任会议，未能届时与会，只好以书面形式向大会作汇报，请大家谅解。这次... Effectively accomplish service work for the industry to achieve “two fundamental changes” - Written speech at the Fourth Association Congress of the Chisel Association (July 23, 1997) Zhang Yucheng Leaders and delegates Comrades: Since Participated in the meeting of directors of the Mechanical Products Quality Supervision and Inspection Center of the Ministry of Machinery, and failed to attend the meeting. They had no choice but to report in writing to the General Assembly. Please understand. this time...