试述典型的消化性溃疡的并发症。
(1)上消化道大量出血。 (2)穿孔。 (3)幽门梗阻。 (4)癌变:胃溃疡可发生癌变。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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