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【单选题】
下列关于局域网设备的描述中,错误的是( )。A.
中继器只能起到对传输介质上信号波形的接收、放大、整形与转发的作用
B.
连接到一个集线器的所有结点共享一个冲突域
C.
交换机端口带宽
D.
二层交换机维护一个表示MAC地址与IP地址对应关系的交换表
拍照语音搜题，微信中搜索"皮皮学"使用
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【单选题】不属于二尖瓣狭窄典型临床表现的是
A.
呼吸困难为最常见的早期症状
B.
重度二尖瓣狭窄常有“二尖瓣面容”，双颧绀红
C.
心尖部舒张期隆隆样杂音
D.
心尖部收缩期吹风样杂音
E.
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【单选题】二尖瓣狭窄的典型临床表现不正确的是
A.
呼吸困难为最常见的早期症状
B.
重度二尖瓣狭窄常有'二尖瓣面容'，双颧绀红
C.
心尖部舒张期隆隆样杂音
D.
心尖部收缩期吹风样杂音
E.
心房颤动为早期并发症
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