The main distinguishing points of pulmonary signs between bronchitis and bronchopneumonia are: dry _ sound can be heard in the lungs of bronchitis, and sometimes thick and medium wet _ sound can be heard, but the _ sound is not fixed and may It disappears due to changes in body position or after coughing. During bronchopneumonia, medium and fine moist _ sound can be heard during lung auscultation, which is more common under the two lungs on the back and next to the spine. It is more obvious at the end of deep inhalation. The _ sound does not disappear due to changes in body position or after coughing.