数据库概念结构的设计是 【12】 。

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数据库概念结构的设计是 【12】

考点:计算机等级考试信息管理技术三级信息管理技术笔试305
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用10米长绳子,做5条同样长的跳绳,每条跳绳长多少米?

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Everyone knows the story of Benjamin Franklin’s famous kite flight. He was a man of many talents and interests. His natural curiosity about things and the way they work made him try to find ways to make them work better. Although he made important discoveries and advancements, Ben didn’t “invent” electricity. He did, however, invent the lightning rod which protected buildings and ships from lightning damage.

In colonial America, most people warmed their homes by building a fire in a fireplace even though it was kind of dangerous and used a lot of wood. Ben figured that there had to be a better way. His invention of an iron furnace stove allowed people to warm their home less dangerously and with less wood. The furnace stove that he invented is called a Franklin stove. Interestingly, Ben also established the first fire company and the first fire insurance company in order to help people live more safely.

As the postmaster, Ben had to figure out routes for delivering the mail. He went out riding in his carriage to measure the routes and needed a way to keep track of the distance. He invented a simple odometer and attached it to his carriage.

In his old age, Ben retired from business and public service and wanted to spend his time reading and studying. He found, however, that his old age had made it difficult for him to reach books from the high shelves. Even though he had many grandchildren to help him, he invented a tool called a long arm to reach the high books. The long arm was a long wooden pole with a grasping claw at the end.

Later, other famous inventors, like Thomas A. Edison and Alexander Graham Bell, would follow in Ben’s footsteps by trying to find ways to help people live better. Today’s curious thinkers are keeping Ben’s traditions alive by inventing new and improved ways to make things work.

68. We can learn from the passage that Benjamin Franklin ___________________.

A. made his first invention using a kite

B. made his living by delivering the mail

C. set up some companies to help people to live better

D. made a stove which used other fuels instead of wood

69. The underlined word “odometer” in Paragraph 3 refers to something that ________.

A. contains the mail                                                 B. shows the direction

C. makes the carriage go fast                    D. records total miles covered

70. Benjamin Franklin invented a long arm in order to _________.

A. replace his disabled arm

B. play games with his grandchildren

C. get books from the bookshelf more easily

D. clean and tidy his house and the bookshelf

71. The last paragraph mainly wants to tell us that _____________.

A. Ben was the most famous inventor.

B. other inventors learned a lot from Ben.

C. Ben’s spirit of inventing remain with us.

D. thinkers are more likely to become inventors

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数字调度系统中继侧接口为ISDN基本速率接口(2B+D)。

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用托辊调位调整输送带跑偏的方法是:将输送带跑偏侧的一个或数个托辊,沿输送带运行方向()移动,每个托辊调整量要少,调整托辊数要多。

A、向后

B、向左

C、向右

D、向前

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化验室发生火灾时,如何迅速采取有效措施进行灭火?

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