起钻过程中，灌入的钻井液体积应小于起出钻具的体积。
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根据《重要地理信息数据审核公布管理规定》，下列内容中，不属于测绘地理信息行政主管部门审核的内容是（）
A. 重要地理信息数据公布的必要性
B. 提交资料的真实性和完整性
C. 重要地理信息数据的可靠性和科学性
D. 获取数据技术装备的可靠性
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。
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
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