根据作者为客户提供技术服务的经验,向预拌混凝土使用者叙述正确使用预拌混凝土的五项作业,并从理论上说明正确使用的必要性以及在作业中忽视该技术会产生的后果。 Based on the author's experience in providing technical services to customers, the user of ready-mixed concrete is presented with five assignments for the correct use of ready-mixed concrete and a theoretical explanation of the need for proper use and the consequences of neglecting the technology in operation.