数据库概念设计的E-R方法中,用属性描述实体的特征,属性在E-R图中一般用下列哪种图

题型:单项选择题

问题:

数据库概念设计的E-R方法中,用属性描述实体的特征,属性在E-R图中一般用下列哪种图形表示

A.矩形

B.四边形

C.菱形

D.椭圆形

考点:计算机等级考试数据库技术三级数据库技术笔试359
题型:单项选择题

When a light passenger plane flew off course[跑道] some time ago, something was wrong with it and it crashed[坠毁] in the mountains and its pilot was killed. The only passengers, a young woman and her two baby daughters, were unhurt. It was the middle of winter. Snow lay thick on the ground. The woman knew that the nearest village was kilometers away. She couldn’t find anything in the snow but a suit-case[行李箱]. When it grew dark, she turned the suit-case into a bed and put the children inside it, covering[盖] them with all the clothes she could find. During the night, it got terribly cold. The woman kept as near as she could to the children and even tried to get into the case herself, but it was too small. Early next morning, she heard planes flying above and wanted to know how she could send a signal[信号Then she had an idea. She wrote the letters ‘SOS’ in the snow. Luckily, a pilot saw the signal and sent a message by radio to the nearest town. It was not long before a group of people arrived and they took the woman and her daughters to hospital at once.

小题1:Where was something wrong with the plane?

小题2:How many people were in the light passenger plane before it crashed?

小题3:What did the woman make the suit-case into a bed for?

小题4:What did the woman do to ask for help?

小题5:Were the woman and her children saved?

题型:单项选择题

全面抗战爆发前,日本对华北地区进行侵略、渗透的重大事件有

①进犯察哈尔地区;②策划“华北五省防共自治”;

③占领平津地区; ④推行“治安强化运动”

A.①②

B.②③

C.③④

D.②④

题型:单项选择题


文字资料一

根据土地利用变更调查结果,2005年全国耕地12208.27万公顷(18.31亿亩);园地1154.90公顷(1.73亿亩);林地23574.11万公顷(35.36亿亩);牧草地 26214.38万公顷(39.32亿亩);其他农用地2553.09万公顷(3.83亿亩);居民点及独立工矿用地2601.51万公顷(3.90亿亩);交通运输用地230.85万公顷(0.35亿亩);水利设施用地359.87万公顷(0.54亿亩);其余为未利用地。与2004年相比,耕地面积减少0.30%,园地面积增加2.31%,林地面积增加0.30%,牧草地面积减少0.21%,居民点及独立工矿用地面积增加1.11%,交通运输用地面积增加 3.37%,水利设施用地面积增加0.26%。
2005年全国耕地净减少36.16万公顷(542.4万亩)。其中,建设占用耕地13.87万公顷(208.1万亩);另外,查出往年已经建设但未变更上报的建设占用耕地面积 7.34万公顷(110.1万亩);灾毁耕地5.35万公顷(80.2万亩);生态退耕39.04万公顷(585.5万亩);因省农业结构调整减少耕地1.23万公顷(18.5万亩);土地整理复垦开发补充耕地30.67万公顷(460.0万亩),土地整理复垦开发补充耕地面积为建设占用耕地的144.56%。
全年新增建设用地43.2万公顷。其中,新增独立工矿(包括各类开发区、园区)建设用地15.11万公顷;新增城镇建设用地9.82万公顷;新增村庄建设用地6.66万公顷;新增交通、水利等基础设施建设用地10.76万公顷。
查明到2004年底,全国城镇规划范围内共有闲置土地7.20万公顷(107.93万亩),空闲土地5.48万公顷(82.24万亩),批而未供土地13.56万公顷(203.44万亩),三类土地总量为26.24万公顷(393.61万亩),占城镇建设用地总量的7.8%。核减建设用地4631.9公顷。
2005年,全国共出让土地面积16.32万公顷,出让价款5505.15亿元。其中,招拍挂出让面积和出让价款分别为5.72万公顷和3920.09亿元,分别占出让总面积和总价款的 35.06%和71.21%。

2005年土地整理复垦开发补充耕地面积与当年实际减少的耕地面积之比为( )。

A.84.82%

B.56.35%

C.51.55%

D.102.35%

题型:单项选择题

治疗婴儿痉挛症时首选的药物是()

A.ACTH或泼尼松

B.氯硝西泮

C.丙戊酸钠

D.卡马西平

E.苯巴比妥钠

题型:单项选择题

沟深600mm—1000mm的电缆沟单侧有电缆支架时的通道宽度不小于()。

A.420mm;

B.400mm;

C.350mm;

D.450mm

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