数据的逻辑结构是从逻辑关系上描述数据,它与数据的______结构无关。

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问题:

数据的逻辑结构是从逻辑关系上描述数据,它与数据的______结构无关。

考点:计算机等级考试C++二级C++笔试
题型:填空题

一张彩纸的面积是45平方分米,已经用去20平方分米.已经用去这张彩纸的几分之几?还剩下这张彩纸的几分之几没有用?

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在一次火警军事演习中,火警战士双手握住竖直的铁杆匀速攀上12m高的楼台,完成指令后又沿铁杆匀速滑下,火警战士受到铁杆的摩擦力分别记为f1和f2,那么(  )

A.f1向下,f2向上,且f1=f2

B.f1向上,f2向上,且f1=f2

C.f1向下,f2向下,且f1=f2

D.f1向上,f2向下,且f1=f2

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Many cities in the world are benefiting from the night activities of a group of people who call themselves guerrilla (游击队) gardeners. Armed with trowels, spades and a van full of flowers and plants, guerrilla gardeners turn abandoned urban land into a blaze of color. In city centre locations where there was mud, weeds and empty plastic bottles, residents often wake up to find that the wasted area has been transformed overnight with brightly-colored bedding plants.

In most British cities, local governments and police turn a blind eye to the effort of the gardeners, whose activities are always carried out under cover of nightfall. And so far, there has been nothing but praise from the astonished and delighted local residents when they find their neighborhood transformed in such a striking fashion.

Not only do the guerrilla gardeners beautify neglected places, they also return regularly to water the plants and weed the flower beds. They also make sure that at least some of the plants they bring are evergreens, which means that the area doesn’t look depressing in the winter months.

The first guerrilla gardener in London was Richard Reynolds, whose day job is at an advertising agency. Mr. Reynolds, a graduate of Oxford University, began his efforts two years ago when he moved to a flat in a tower block in South London. From his balcony, he could see several empty concrete pots, placed by the local governments to contain plants but never used. He went out after midnight and filled the pots with plants, and then planted more flowers in the path leading to the entrance to the block.

He then set up a website to explain his plan and called upon more gardeners to join him. Cash donations flooded in and, more importantly, volunteers rushed to be part of the campaign. Within six months, there were five hundred people in London prepared to come out at very short notice to restore neglected parts of the urban landscape. There are now unofficial but carefully-organized groups in many cities in Britain and North America and there is also a website where would-be urban gardeners can find out the location of the next expedition.

小题1:These guerrilla gardeners do their work ______.

A.at the request of the government

B.nearby their house

C.often in return for others’ help

D.out of their own free will小题2:Richard Reynolds decided to fill the pots with plants in order to ______.

A.plant more flowers in the path

B.beautify the neighborhood

C.attract attention for his ad agency

D.make the plants a feast for his eyes小题3:The guerrilla gardeners often return to their night working places with the purpose of ______.

A.looking after these plants

B.enjoying these beautiful flowers

C.helping plants live through winter months

D.changing the varieties of the plants小题4:It can be inferred from the text that these guerrilla gardeners ______.

A.are mainly from the United Kingdom

B.will later get well paid

C.are still not accepted by the local government

D.become more and more organized

题型:填空题

如果一定让子容器的GPO继承父容器的GPO,可以设置父容器为阻止继承。

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依据GB/T28001-2011的4.2的要求,下述对职业健康安全方针最准确的要求是().

A、包括至少遵守与其职业健康安全危险源有关的适用法律法规要求的承诺

B、传达到全体员工,使其认识到各自的职业健康安全义务

C、应清楚阐明职业健康安全总目标

D、包括持续改进的承诺

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