Gastroesophageal reflux disease (GERD)is a chronic condition that causes indigestion, acid reflux, and sometimes a cough. The reason that GERD causes a chronic cough isn't apparent, but researchers believe it occurs due to gastric secretions (stomach acid) irritating the lining of the esophagus (...
not all of them do.check to see if you are right by using a pencil to go over the diagram.remember not to miss any points or go over any line twice,give a reason if there is no path 现在使用那里Euler的rule.do这些peoblems计算下面有Euler道路?不是所有do.check看见您是否通过使用铅笔正确...