For foundry sand from a famous domestic area, the curve of thermal expansivity with the temperature was described.
本文最后给出了利用本装置测得的国内某著名铸造用原砂的热膨胀-温度曲线。
The practical value of knowledge resources possesses popularity, duality of exhaustiveness and non exhaustiveness, and expansivity.
知识资源的使用价值具有广普性、非耗竭与耗竭二重性及扩张性 ;
For each test series the samples were maintained according to its own maintaining method and the loss rate of quantity or length expansivity was measured in defined period.