Total sulphur content in the cement should not be more than _____

We can obtain lake asphalt from lakes at _____

Which of the following statements about gypsum is not correct?

In England, high alumina cement is known by the trade name of _______

Which of the following is not true about cork?

The ratio of the percentage of alumina to that of oxide of iron in the cement should not be less than ____

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

The amount of inert filler in plastic bitumen is about _____