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.
A magnesium deficiency will not cause blurry vision, but other conditions may. If you experience gradual changes in your vision, it could indicate the need for a new eyeglass prescription, or you may have an eye condition such as cataracts or glaucoma.