The first day of school in the China falls on 1 September, or the first Monday following if September 1 is a Friday, Saturday, or Sunday. In northeastern China, schools open on Monday in mid-August after summer vacation.
3) Improper heating profiles setting lead to unbalanced heating zones temperature inside heating furnace, which causes uneven glass temperature on both different parts of the glass sheet and between the top and bottom glass surfaces, thus may brings irregular white haze on glass surfaces.
Alcohol can wipe eyeglass lenses, but it is limit to glass lenses. Because alcohol is an organic solvent, the resin material, the surface coating of the lens can not use alcohol to wipe. With alcohol to wipe, the sunglasses lens can easily erase the outer membrane, it make damage to sunglasses lenses, So you'd better not use alcohol to wipe.