高碱度烧结矿

阅读下列材料：

  法律是国家意志的体现。中国古代“明法度，定律令，皆以始皇起”；近代以来，“法制是政治文明最坚实的基础，是让法律成为治理国家最高权威的手段”。结合所学知识回答下列问题：

（1）简述秦统一后，秦始皇制定的法律措施的最大特点是什么？

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（2）近现代资本主义法制的先声是从哪个国家发端的？简述这个国家强化法律措施的主要表现。

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（3）近代英、美制定了哪些宪法或宪法性质的文件？这些文件是如何体现资产阶级利益的？

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（4）简述中国近代史上具有进步意义的重大法律文献及其历史作用。

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阿伏加德罗常数约为6.02×10²³mol^-1。下列叙述中正确的是[ ]

A．标准状况下，2.24L苯中约含有3.612×10²³个碳原子

B．常温常压下，氧气和臭氧的混合物16g中约含有6.02×10²³个氧原子

C．25℃时，1L pH=13的氢氧化钠溶液中约含有6.02×10²³个氢氧根离子

D．0.5mol CH₄中约含有3.01×10²⁴个电子

管道工程由若干管路系统所组成，按其服务日的不同可分为2大类，即（）。

A．建筑设备工程管道系统

B．给水管道系统

C．排水管道系统

D．工业管道系统

A Battery’s Nightmare

Portable electronics that can be carried about easily are only as good as their batteries (电池) and, let’s face it, batteries aren’t very good, especially when compared with, say, petrol, which packs 100 times a battery’s energy into an equal space. That’s why a large group of mechanical engineers (centered at the Massachusetts Institute of Technology, but with partners at other universities and companies) are hard at work in an effort to replace batteries with a tiny engine that runs on fuel. Imagine a battery-free life! When the fuel runs out in your mobile phone, you just fill up and go.

The engine---about the size of a ten-cent coin---starts with a combustion chamber (燃烧室) that burns hydrogen. Its tiny parts are etched (蚀刻) onto silicon wafers (硅片) in the same manner that computer parts are etched onto integrated circuits (集成电路). The first engine is made up of five wafers. And since these wafers could be produced in much the same way as computer chips, they could probably be produced quite cheaply.

But the devil in all this nice detail is efficiency. Tiny engine parts don’t always behave like the bigger parts of the first engine. Something between the parts can slow down the works, according to Columbia University Professor LucFrechette, one of the engine’s designers. Extreme heat from the combustion chamber is also a problem, often leaking to other parts of the engine.

The scientists’ goal is to create an engine that will operate 10 times better than batteries operate. Frechette says that a complete system, with all parts in place and working, will be set up in the next couple of years, but commercial models aren’t likely until at least the end of the next ten years.

小题1:According to the passage, the title suggests that _______ .

A．batteries should be greatly improved

B．petrol will be used instead of batteries

C．the time of batteries will be gone forever

D．pollution problems caused by batteries must be solved小题2:What’s the meaning of the underlined word “devil” in paragraph 3?

A．Problem

B．Advantage

C．Invention

D．Technique小题3:What can we infer from the passage?

A．The new invention doesn’t need any fuel.

B．The new engine has been produced in large quantities.

C．The new invention is much cheaper than the battery.

D．The new engine needs to be improved before it’s on sale.

（）是指当事人自行协商解决因合同发生的争议。

A.和解

B.诉讼

C.仲裁

D.调解