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问题 单项选择题

用某实验室的测汞仪，测定同一含低浓度汞的样品多次（6次以上），计算测定值的标准偏差为0.01μg，该实验室测汞的定量下限为（）

A.0.05μg/L

B.0.05μg

C.0.10μg/L

D.0.10μg

E.0.15μg/L

答案

参考答案：D

单项选择题

孙某在广州工作，一日晚上被广州市甲区公安局吴某等人拦住检查证件，由于孙某没有带暂住证而被吴某等人抓人收容所并遭毒打致死。该事件被揭露后，群情激愤。对本案的侦查应由下列哪个机关进行：

A．公安机关

B．人民检察院

C．国家安全机关

D．经省级以上人民检察院决定，方可由人民检察院立案侦查
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问答题

People have cooked over open fires and dirty stoves for all of human history, but the simple fact is they are slowly killing millions of people and polluting the environment. Engineers and development professionals have worked on this problem for decades. My own involvement stretches back many years, and I’m well aware that well-meaning efforts have been launched, but none have managed to match the scope of the challenge.
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