在X线摄影中,将滤线栅置于胶片与肢体之间,焦点到滤线栅的距离与滤线栅焦距相等,并使X

题型:单项选择题

问题:

在X线摄影中,将滤线栅置于胶片与肢体之间,焦点到滤线栅的距离与滤线栅焦距相等,并使X线中心线对准滤线栅中心线。使用滤线栅摄影时,冲洗后的照片有的中心有密度而两侧无密度;有的一边高密度,另一边低密度。

下列叙述正确的是

A.栅比越大消除散射线能力越差

B.栅密度越大消除散射线能力越差

C.曝光量倍数越小越好

D.滤线栅反置时两侧密度高,中间密度低

E.滤线栅不能改善影像对比度

考点:放射医学技师放射技师专业知识初级放射医学技师专业知识
题型:单项选择题

在编制铁路工程质量计划时,计划的主要内容应该有()。

A.编制依据、项目概况

B.质量目标、组织机构、质量控制及管理组织协调的系统描述

C.必要的质量控制手段,施工过程、服务、检验和试验程序等、确定关键工序和特殊过程及作业指导书

D.与施工阶段相适应的检验、试验、测量、验证要求、更改和完善质量计划的程序

E.施工完成后的工务维修质量措施

题型:单项选择题

The first newspaper was written by hand and put up on walls in public places. The earliest daily newspaper was started in Rome in 59 BC. In the 700s the world’s first printed newspaper was published. Europe didn’t have a regularly printed newspaper until 1609, when one was started in Germany.

The first regularly published newspaper in English was printed in Amsterdam in 1620. In 1621, an English newspaper was started in London and was published once a week. The first daily English newspaper was the Daily Courant, which came out in March 1702.

In 1690, Benjamin Harris printed the first American newspaper in Boston .But not long after it was first published, the government stopped the paper. In 1704, John Campbell started the Boston Newspaper, the first newspaper published daily in the American colonies(殖民地). By 1760, the colonies had more than thirty daily newspapers.There are now about 1, 800 daily papers in the United States.

Today, as a group, newspapers in English have the largest circulation (发行量)in the world .But the largest circulation for a newspaper is that of the Japanese newspaper Asahi Shimbun . It sells more than eleven million copies every year.

小题1:The first regularly printed European newspaper started in ________.

A.Rome in 59 BC

B.Germany in 1609

C.Amsterdam in 1620

D.England in 1621小题2:The first daily newspaper in English started in _________.

A.1620

B.1621

C.1590

D.1702小题3:What does the author want to inform us?

A.History of newspapers

B.History of daily newspapers

C.The beginning of newspapers

D.On reading newspapers

题型:单项选择题

下列关于软膏基质的叙述中错误的是()

A.液状石蜡主要用于调节软膏稠度

B.水溶性基质释药快,无刺激性

C.水溶性基质由水溶性高分子物质加水组成,需加防腐剂,而不需加保湿剂

D.凡士林中加入羊毛脂可增加吸水性

E.硬脂醇是W/O型乳化剂,但常用在O/W型乳剂基质中

题型:单项选择题

下列哪项是引起新生儿坏死性小肠结肠炎的发病原因()

A.大肠杆菌

B.病毒

C.铜绿假单胞菌

D.真菌

E.肠黏膜损伤与感染

题型:单项选择题

乾坤二卦的爻辞是一一对应的,乾卦的爻辞九二对应的是坤卦的()。

A.初六

B.六二

C.六三

D.六四

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