患者,男性,64岁,慢性乙型病毒性肝炎30余年。进食油炸麻花后突发呕血和黑粪。该患者呕血的原因可能是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧