湖北省消除疟疾流行县分类，是根据2006-2008年疟疾疫情报告，其中一类县是三年均有本地感染病例，连续三年发病率（），二类县是三年有本地感染病例，且至少一年发病率（）；三类县是三年（）报告。
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A project requires a new server to be set up with the ability to automatically fail over its Ethernet connection to a second connection if a network failure occurs. Which of the following provides greatest resiliency？（）
A. Two switch ports will be needed on a switch， two Ethernet cables will be needed for the server each connecting to two different Ethernet cards， and one IP address will be needed.
B. Two switch ports will be needed on two different switches， two Ethernet cables will be needed for the server each connecting to two different Ethernet cards， and one IP address will be needed.
C. Two switch ports will be needed on two different switches， two Ethernet cables will be needed for the server each connecting to two different Ethernet cards， two different IP addresses will be needed.
D. One switch port will be needed on one switch， a splitter will be needed to split the connection， two ethernet cables will be needed for the server each connecting to two different Ethernet cards， and two different IP addresses will be needed.
《外出经营活动税收管理证明》的有效期限一般为()。
A. 10日
B. 20日
C. 30日
D. 60日
从听觉障碍的分类来看，极难感觉声音的存在，需要借助助听器的辅助才能感受声音的震动力，这属于（）。
A. 二级重听
B. 一级重听
C. 二级聋患者
D. 一级聋患者
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