Tensile strength of rubber belts is about ___

The coefficient of heat conductivity of heat-insulating materials does not exceed _____

Nitrocellulose glues are prepared from _____

Which of the following is not a property of a good electrical insulator?

The final setting time of high alumina cement is about ___

Which of the following oils is obtained by boiling fats and other parts of cattle with water?

During the setting action of the cement, tricalcium aluminate is formed within ____ after adding water to the cement.

Tensile strength of leather belts should be about ___