The essence of concrete framework theory is to deduce the cement dosage of unit volume concrete from frame-mortar ratio, unit water dosage and deviated function of cement-sand ratio.
混凝土架构设计理论的实质，是通过架浆比、单位用水量以及砂灰比偏离三个参数推求单位水泥用量的过程。
2
According to microstructure analysis, cracks in bolster and side frame produced by Furan self-cured sand can be classified into shrinkage hot cracks and stress hot cracks.
显微组织分析表明，呋喃树脂砂生产摇枕、侧架所出现的裂纹按照产生原因分为缩裂纹和拉裂纹。
3
Nowadays, abaci are often constructed as a wooden frame with beads sliding on wires, but originally they were beads or stones moved in grooves in sand or on tablets of wood, stone, or metal.