
肥厚型心肌病的瓣膜音特点为( )。
开瓣音
Graham-Steell杂音
枪击音
吸气时血压下降至85mmHg
胸骨左缘3~4肋间收缩期喷射性杂音
Because the United States is not surrounded by many other nations, some Americans tend to _____ the rest of the world.