Purpose: This experiment aims to discuss the resistance to compression, the anti-bending strength, and the size of different kinds of plaster models(calcium sulfuricum或者 regular plaster以后用A代替了 and die stonesB) after agitating them in the water with different temperatures, and to find the most appropriate temperature for the plaster agitation model.
Method: Prepare the A and B solution with a certain ratio and make a cylinder with a resistance to compression of 20mm, and a anti-bending strength of 40mm. Each kind should be divided into 28 groups. Put them in the temperature of 0..... respectively and agitate the plaster. Leave them there for 30 mins .... 24 hours. Then, measure the changes of resistance to compression and anti-bending strength and size changes.
Result: 1) There is a obvious difference in the resistance to compression of the regular gesso (p
模型：泉华-金属片 滤波器
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