将横断面和追踪调查两种方法混合,以克服追踪调查所需年限太长和观察对象容易流失的缺点属

题型:单项选择题 B型题

问题:

将横断面和追踪调查两种方法混合,以克服追踪调查所需年限太长和观察对象容易流失的缺点属于()

A.横断面调查

B.追踪性调查

C.问卷调查

D.筛查

E.半纵向调查

考点:健康教育相关专业知识学校卫生概述学校卫生概述题库
题型:单项选择题 B型题

2011年9月,河北省永年县发现距今已有121年历史,清朝光绪年间科举考试考卷,此卷为清代进士孟庆荣在光绪庚寅年(1890年)的翰林考试试卷。清文,我国科举制度正式形成于

A.隋炀帝时

B.隋文帝时

C.唐太宗时

D.唐玄宗时

题型:单项选择题 B型题

读“商业、工业、住宅三种经济活动付租能力随距离递减示意图”,完成题。

小题1:在竞争环境下,城市的每一块土地用于哪种经济活动,取决于各种活动的

A.规模的大小

B.重要的程度

C.付出租金的高低

D.由政府的决策小题2:土地租金高低取决于下列因素:①距离市中心的远近;②土地利用方式;③交通通达度;④企业的支付能力。其中主要的是

A.①②

B.①③

C.②④

D.③④小题3:图中A、B、C三功能区依次是 (  )

A.商业区、工业区、住宅区 B.工业区、住宅区、商业区

C.商业区、住宅区、工业区 D.商业区、住宅区、文化区

题型:单项选择题 B型题

用自由落体法进行“验证机械能守恒定律”的实验

(1)实验完毕后选出一条纸带如图所示,其中O点为电磁打点计时器打下的第一个点,A、B、C为三个计数点,打点计时器通以50Hz的交流电。用刻度尺测得OA=12.41cm,OB=18.60cm,OC=27.21cm,在计数点A和B、B和C之间还各有一个点,重物的质量为1.00kg,取g=9.80m/s2。甲同学根据以上数据算出:当打点计时器打到B点时重物的重力势能比开始下落时减少了________J;此时重物的动能比开始下落时增加了_______J。(结果均保留三位有效数字)。

实验中产生系统误差的原因是______________________                       

(2)乙同学利用他自己实验时打出的纸带,测量出了各计数点到打点计时器打下的第一个点的距离h,算出了各计数点对应的速度v,以h为横轴,以为纵轴画出了如图的图线。图线未过原点O的原因是____________________________________________。

题型:单项选择题 B型题

发动机燃油关断活门作动器的接近位置是()

A.大翼前樑

B.大翼后樑

C.主起落架轮舱

D.发动机风扇机匣

题型:单项选择题 B型题

Seeking to build support among black families for its education reform law, the Bush administration paid a prominent black pundit $240,000 to promote the law on his nationally syndicated television show and to urge other black journalists to do the same.
The campaign, part of an effort to promote No Child Left Behind (NCLB), required commentator Armp Williams "to regularly comment on NCLB during the course of his broadcasts," and to interview Education Secretary Rod Paige for TV and radio spots that were aired during the show in 2004.
Williams said Thursday he understands that critics could find the arrangement unethical,but "I wanted to do it because it’s something I believe in." The top Democrat on the House Education Committee, Rep. George Miller of California, called the contract "a very questionable use of taxpayers’ money" that is "probably illegal".
The contract, detailed in documents obtained by USA TODAY through a Freedom of Information Act request, also shows that the Education Department, through the Ketchum public relations firm, arranged with Williams to use contacts with America’s Black Forum, a group of black broadcast journalists, "to encourage the producers to periodically address" NCLB. He persuaded radio and TV personality Steve Harvey to invite Paige onto his show twice. Harvey’s manager, Rushion McDonald, confirmed the appearances.

According to the passage, "No Child Left Behind (NCLB)" was most possibly a new______.

A. law recently passed

B. campaign at large
C. Bush government plan

D. broadcast program

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