题目内容

建筑石膏的特性有哪些?为什么说建筑石膏及制品适用于室内,而不适用于室外?

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石膏制品具有较好的防火性能,其原因是()。(1)火灾时CaSO4·2H2O脱水,表面形成水膜;(2)石膏制品孔隙率大(3)石膏硬化时约有1﹪的膨胀率;(4)石膏吸水率大;(5)石膏制品导热率低

A. (1)(2)(3)
B. (1)(3)(5)
C. (1)(2)(5)
D. (1)(4)(5)

建筑石膏是()型的()膏,硬化后的石膏的化学成分是()。

Nearly one third of the people we interviewed think people from different cultures shouldn't get married, claiming that they cannot be____.

Telecommunications technologies have____into everyday life so deeply that modern society could not function without them.

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