The use of fire,the emergence of technological production,the appearance of alchemy,and the rise of medical science offered opportunities for the experiment and pushed it forward in the early age.
火的使用、工艺生产的产生、炼金术的出现及医药学的兴起是有机化学实验产生及早期发展的重要源泉。
By using the newest temperature-stress testing machine, the cracking resistance of concrete at early ages is studied and the evolution rules of temperature,stress,deformation are achieved.
利用国内最新研发的温度-应力试验机针对混凝土的早期抗裂性能进行了一系列研究,得出混凝土早期温度、应力、变形的发展规律。
Early age cracking of concrete has re-emerged as an important issue all over the world in recent years.
近年来混凝土早期裂缝问题再次引起全球工程界的广泛关注。