Keep food original color, flavor and taste sensory properties is one of the principle of Food Fortification.

The Seismic Fortification Classification of Buildings categorizes buildings into four groups according to their importance and function of these buildings in earthquake events, among which, the elementary school buildings belong to ( ) Class . A: A B: B C: C D: D

Seismic fortification classification criteria standard divides the building into four categories according to the importance of the buildings. Among them, a large number of buildings belonging to ( ), such as general industrial and civil buildings, residential, hotels, etc. A: A Class B: B Class C: C Class D: D Class