铬酸钾指示剂法测定Br¯含量时，若蒸馏水中含有微量Cl¯，为了得到准确的分析结果，应作（）。
A. 空白试验
B. 回收试验
C. 对照试验
D. 增加测定次数
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Which statement best describes the differences between Cisco SMARTnet and Cisco SMARTnet onsite？（）
A. CiscoSMARTnet Onsite includes all of the elements of Cisco SMARTnet， with the additional provision of onsite technician to perform parts replacement
B. CiscoSMARTnet Onsite is primary attractive to customers who do not need to replace their hardware immediately， but would still like an onsite technician to install and replace hardware
CiscoSMARTnet Onsite includes certification classes and live network consulting at the customer site
D. CiscoSMARTnet Onsite provides network monitoring for small-to-medium sized businesses and provides onsite technical resources when hardware problems are detected
根据《中国移动江苏公司网优建设项目验收规范（2011版验收分册）》为射频拉远单元供电时布放的室外直流电源线，其金属屏蔽层应在天线处，离塔处以及机房入口处进行“三点接地”保护。
A. 正确
B. 错误
行政执法机关不履行法定职责、违反法定程序以及违法委托行政执法的，由本级人民政府或者其上级主管部门予以依法批评教育和责令改正即可。
A. 正确
B. 错误
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