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When you think of the Internet, you probably think of ".com." Just what do those three letters at the end of a World Wide Web address mean Every computer that hosts data on the Internet has a (71) numerical address. For example, the numerical address for the White House is 198.137.240.100. But since (72) people want to remember long strings of numbers, the (73) was developed. It is a critical part of the Internet’s technical infrastructure, correlates a numerical address to a word. To (74) the White House website, you could type its numerical address into the address box of your web browser. But most people prefer to use "www.whitehouse.gov." In this case，the domain name is (75) .

（71）处填（）。

A．unique

B．isolated

C．similar

D．same

2012钓鱼岛事件中国政府是什么态度，且采取什么样的措施（）

A.日本所有进口、出口的东西全部要求每箱打开严格检查，来延误中日贸易。

B.派遣中国渔政船到钓鱼岛海域巡航。

C.组织和领导中国人民抵制日货。

D.温 * * 拒绝会见日本首相。

为了做好防冻防凝工作，低温处的阀门井、消火栓、管沟要逐个检查，排除积水，采取（）措施。

A、加固

B、疏导

C、防冻保温

D、吹扫

简述平流式沉淀池的优缺点。 

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