Exhalation occurs when the diaphragm relaxes, returning to its dome form and pushing air out on the lungs. This rhythmic contraction and relaxation are essential for retaining typical breathing and ensuring enough oxygen source to your body.Bơm trục vít Roto Bơm định lượng trục vít Bơm hóa chất argal bơm hóa chất cheonsei Bơm