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问题 单项选择题

胸导联V2探查电极放于( )。

A．胸骨右缘第3肋间
B．胸骨右缘第4肋间
C．胸骨左缘第4肋间
D．左锁骨中线第5肋间
E．左腋前线与V4同一水平

答案

参考答案：C

解析：[考点] 心电图检查
[重点等级] ★★★★

选择题

下列省（区） 的名称、简称与行政中心的组合，正确的是（　　）

A．吉林省-吉-吉林

B．贵州省-贵-贵阳

C．广东省-广-广州

D．山东省-豫-济南
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单项选择题

TCP/IP (71) layer protocols provide services to the application (72) running on a computer. The application layer does not define the application itself, but rather it defines
(73) that applications need — like the ability to transfer a file in the case of HTTP. In short, the application layer provides an (74) between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP (75) layer consists of two main protocol options — the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

A. iteration B. objectC. interface D. activity
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