患者,男,65岁。间断咯血1个月余,伴劳力性呼吸困难。查体示双肺少量湿性啰音,心率103次/分,未闻杂音。化验检查示血红蛋78g/L,尿常规示红细胞满视野,BUN20mmo/L,胸片示双肺弥漫性毛玻璃影。对于诊断意义不大的检查是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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