题目内容

To make a correct mix for dental stone when using 50g ofpowder,the amount of water wouldbe

A. 10~12ml
B. 14~15ml
C. 28~30ml
D. 45~50ml

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The desirable strength ofgypsum materials is()related to the amount ofwater used

A. Directly
B. Indirectly
C. not
D. partially

控制石膏材料凝固速度的方法有哪些?

钢中气体主要指氢和氮,一般来说()的含量较高,且较难去除。

()是指以CaO和MgO为主组成的耐火材料。

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