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问题 单项选择题

女性，30岁，诊断为甲亢，清晨测脉率100次／分，脉率不齐，脉搏强弱不均，可能发生了 （）

A.窦性心动过速

B.窦性心律不齐

C.房颤

D.阵发性室上性心动过速

E.室颤

答案

参考答案：C

单项选择题

One ofthe main resposibilities ofICMP is to report  （） . Although technology hasproduced increasingly relaible transmission media, errors still exist and must be handled. IP isan  （）  protocol. This means that error checking and error control are not a concem ofIP. ICMP was designed, in part, to compensate for this shortcoming. Howerver, ICMP doesnot  （） errors, it simply report them. Error correction is left to the higher-levelpotocols. Error messages are always sent to the original  （）  because the only informationavailable in the datagram about the route is the source and destination IP addresses. ICMP usethe source IP address to sent the error massage to the source ofthe（）.

ICMP usethe source IP address to sent the error massage to the source ofthe（）.

A．datagram

B．frame

C．service

D．protocol
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判断题

静像上传铁道部时必须有调度命令和现场抢险指挥中心最高领导签字后方可执行。
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