Finally, they are bleached with sulfur dioxide and sorted into grades.
The nonferrous, or non-iron-bearing, metals had also been separated, and the copper had been further subdivided into grades.
Children who earlier studied all together in a one-room schoolhouse, for instance, were divided into grades by age.
In one of the large community rooms, students of all ages (Sudbury schools do not divide students by age or into grades) were participating in several different activities.
Purification methods consist of chemical treatment, decolorization by adsorbents, and fractionation of the separated waxes into grades by distillation, recrystallization, or both.
Teachers of classes as early as kindergarten factor good behavior into grades — and girls, as a rule, comport themselves far better than boys.
The bureau introduced the Independent School Entrance Examination, an admission test for entrance into grades 5 through 12, and the Comprehensive Test Program, a series of aptitude tests now administered to 260,000 students each year.
Farmers pick just about everything off the trees and take the harvest into a packing shed, where it gets sorted into grades and boxed up for delivery to supermarkets.
