Christopher Columbus discovered America in 1492.
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The immediate cause of the first World War was the death of the Archduke of Austria.
A. 对
B. 错
George Washington, Benjamin Franklin, and Abraham Lincoln were regarded as the founding fathers of the United States of America.
A. 对
B. 错
关于痰液的体位引流，下列描述不妥的是
A. 引流时使病变部位支气管向下
B. 引流应在餐后进行
C. 为加强引流效果，可同时辅以胸部叩击
D. 每次引流时间不超过30分钟
E. 引流过程中注意观察病情
引起呼气性呼吸困难最常见的病因是
A. 气道异物
B. 大支气管肿瘤
C. 大片肺组织实变
D. 大量胸腔积液
E. 小支气管痉挛
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