患者,女性,45岁。风湿性心瓣膜病史6年,护理体检心尖部闻及舒张期隆隆样杂音,典型的二尖瓣面容,其面容特点是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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