For concrete exposed to a very aggressive environment the w/c should be lower than ______

Approximate ratio of direct tensile strength to flexural strength is ________

The quality of concrete, specifically a ________ cement content, is the best protection against sulphate attack.

Reinforced cement concrete is equally strong in taking ______

The quality of concrete, specifically a ________ w/c ratio, is the best protection against sulphate attack.

Strength of concrete is proportional to __________

The philosophy of prescribing low ________ cement to improve resistance to sulphate attack.

In order to avoid segregation, the concrete should not be thrown from a height.