男,20岁,晨起突然呕吐咖啡色液体2h,既往健康。查体:血压90/60mmHg。神志清,腹平软,无压痛,肝脾肋下未及。估计其出血量为()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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