论文部分内容阅读
前言为适应港口建设飞速发展的需要,交通部第一航务工程局设计研究院、第一工程处和第四工程处等单位,于1974年共同开展了混凝土冬季施工早强剂的试验研究工作。
Preface In order to meet the needs of the rapid development of port construction, the First Flight Engineering Bureau of the Ministry of Communications Design and Research Institute, the First Engineering Department and the Fourth Engineering Department and other units in 1974 to carry out concrete winter construction early strength agent test research.