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
The desirable strength ofgypsum materials is()related to the amount ofwater used
A. Directly
B. Indirectly
C. not
D. partially
钢中气体主要指氢和氮,一般来说()的含量较高,且较难去除。