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编者按 为了研究解决砼砌块墙体裂缝问题，中国建筑砌块协会于１９９９年１１月８～１１日在杭州市召开了′９９砼砌块墙体裂缝研讨会，参加会议的有来自全国２３个省、市、自治区的２４８名代表，他们除积极撰写论文（这些论文已汇编成《′９９砼砌块墙体裂缝研讨会论文集》
In order to solve the problem of cracks in concrete block walls, the China Building Block Association convened a ’99 block wall crack workshop in Hangzhou from November 8 to November 11, 1999. 248 representatives of provinces, municipalities, and autonomous regions, in addition to actively writing papers (these papers have been compiled into “Memorial Symposium on ’99 Wall Block Cracks’”