遮线器安装于X线管组件的() A.左侧 B.右侧 C.上方 D.管套内 E.窗口处

题型:单项选择题 A1/A2型题

问题:

遮线器安装于X线管组件的()

A.左侧

B.右侧

C.上方

D.管套内

E.窗口处

考点:医技考试放射技士相关专业知识放射医学技术士相关专业知识模拟试题一
题型:单项选择题 A1/A2型题

秋天,在桃树上发现个别芽发生变异,欲将变异芽的性状保留下来,应(   )

A.等开花时进行自花传粉

B.等开花时接受同株花粉

C.等开花时接受异株花粉

D.取下变异芽嫁接到砧木上

题型:单项选择题 A1/A2型题

一太阳能空气集热器,底面及侧面为隔热材料,顶面为透明玻璃板,集热器容积为V0,开始时内部封闭气体的压强为P0,经过太阳曝晒,气体温度由T0=300K升至T1=350K。

(1)求此时气体的压强。

(2)保持T1=350K不变,缓慢抽出部分气体,使气体压强再变回到p0。求集热器内剩余气体的质量与原来总质量的比值,判断在抽气过程中剩余气体是吸热还是放热,并简述原因。

题型:单项选择题 A1/A2型题

     Many people have heard stories of the California gold rush during the 19th century, when lots of

people went there in search for gold. Panning (淘洗) for gold has a rich and interesting history.

Nowadays some people continue to pan for gold in California. Although it cannot be regarded as a

method for earning income, taking on gold-panning as a hobby can give you a feeling of being in the old

west and get you out into nature.

     The only tool that is required to pan for gold is a gold pan. You can use a regular old flat pan, but

"officially" gold pans are quite cheap so you may as well buy one that is made for the task. Most sold

pans come in either plastic or metal.

     Once you have your pan you will want to start practicing your gold panning technique. Panning for

gold works because gold is much heavier than most rocks. To pan for gold you add rock and dirt form

the bottom of a stream to your pan and then gently let water flow through the pan. The lighter-weight

rocks are slowly swept away while any gold will be left behind in the pan.To start panning for gold, first

you will need to find a good location. Try checking maps of your area and old history books to find

location where there were gold mines in the past. Even though most of the gold have already been

removed, there are likely to be small leftovers that you can find. Once you have found an area that looks

promising, look for any small stream or river where you can try out panning for gold.

     Panning for gold requires patience and it may be a long time before you hit anything of value. However, it is an enjoyable hobby and provides a great opportunity to get outdoors, so don't give up too quickly.

1. What is Paragraph 3 mainly about?

A. Where to pan for gold.

B. How gold-panning works.

C. What tools are needed.

D. A promising area for panning.

2. What is the author's attitude toward modern gold-planning?

A. Opposed.

B. Indifferent (漠不关心的).

C. Positive.

D. Neutral (中立的).

3. In which part of a newspaper would you probably find this article? 

A. Lifestyle.

B. Health.

C. Travel.

D. Sports.

题型:单项选择题 A1/A2型题

关于萎缩,下列说法错误的足()

A.营养不良性萎缩也是机体防卫的一种适应机能

B.营养不良时动物机体可以通过萎缩来减少能量消耗

C.压迫性萎缩仅仅是由压力的直接作用导致的

D.营养不良时.动物机体可以通过萎缩来维持重要器官的活动

题型:单项选择题 A1/A2型题

提高合成塔循环气中的甲烷含量,对甲醇合成反应的影响为()。

A、降低反应速度

B、加快反应速度

C、反应平衡向生产物方向移动

D、降低甲醇产量

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