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自1980年1月1日起,我国将全面执行新的水泥标准。据根新标准,水泥厂将供应软练标号水泥,以前的硬练标号即行作废。为了摸清水泥标号由硬练改为软练
Since January 1, 1980, China will fully implement the new cement standard. According to the new standard, the cement plant will supply soft-labeled cement, and the previous hard-coded label will be set aside. In order to find out the cement label from hard training to soft training