彩色取样框愈大,帧频下降愈明显,这是因为A.计算机能力有限 B.探头接收信号超负荷

题型:单项选择题

问题:

彩色取样框愈大,帧频下降愈明显,这是因为

A.计算机能力有限

B.探头接收信号超负荷

C.信号传输系统超负荷

D.A/D转换能力下降

E.D/A转换能力下降

考点:超声波医学主治医师超声医学基础知识超声医学科主治医师基础知识3
题型:单项选择题

眼眶蜂窝织炎包括哪些()

A.眼睑水肿

B.葡萄膜炎

C.视力减退

D.眼球突出

E.视盘水肿

题型:单项选择题

下列各句中,没有语病的一句是(  )(3分)

A.墨西哥一家舞厅发生了一起有多人丧命的踩踏惨案,警方称,原因是由于夜总会老板故意制造恐慌和紧急出口处受阻引起的。

B“在别人贪婪的时候恐惧,在别人恐惧的时候贪婪。”“股神”沃伦·巴菲特这句投资格言一直被支持者奉为经典。时下动荡的全球金融市场,正验证这位亿万富翁的投资理念。

C.虽然无家可归的人数众多,但解放军和武警官兵的艰苦努力,使边远地区的灾民也全部得到毯子、衣服、帐篷和救援物资。

D.奥运村使用了可再生能源、先进的循环系统和朴素的建筑外观,一旦完全投入使用,奥运村每年的碳排放量可减少8000吨。

题型:单项选择题

患者,女性,46岁,慢性进行性全身无力1年余。肌电图显示有广泛的纤颤电位和束颤电位,运动单位动作电位偏宽大,多相波明显增多,最大用力收缩呈混合干扰型,正中神经的传导速度是48m/s,腓神经的传导速度是40m/s,可诊断为()。

A.脱髓鞘性周围神经病

B.进行性肌营养不良

C.前角细胞疾病

D.正常所见

E.不能作出结论

题型:单项选择题

New rules will let millions of Americans know where more of their food comes from. The law is known as COOL—Country of Origin Labeling.

American Congress first passed the law in 2002. Stores have had to label seafood by country of origin since 2005. But industry pressure delayed other requirements until last week.

Products that must now be labeled include fresh fruits and vegetables, muscle meats and some kinds of nuts. But the rules are complex, and many foods are excluded. For example, organ meats are free to be labeled. So are processed foods, including cooked or smoked food.

The United States has imported more and more food in recent years to save money and expand choices. Country-of-origin labeling has become more common lately but has still been limited in many stores.

Food safety is one reason why some shoppers pay close attention to where foods came from. For example, when a large number of people recently got sick from salmonella(沙门菌病), officials blamed peppers from Mexico. Yet the last big food scare involved spinach (菠菜) grown in California. But labeling is also a way for people to know they are getting what they want. Some want to buy local foods or foods from a particular country.

The country-of-origin labeling law gives stores 30 days to correct any violations that are found. Stores and suppliers that are found to be deliberately violating the law could be fined 1000 dollars per violation. Federal inspectors are not to take action to enforce the law for six months to give time for an education campaign.

Some food safety activists say they are generally pleased with the law. They call it a good step that will give people more useful information.

1. What’s the regulation in the new rules?

A. Stores have to label food by its producing date from now on.

B. The country-of-origin labeling has to be marked on more food.

C. Stores have to label seafood by country of origin.

D. Labeling of food should include more useful information.

2. Why has more and more food been imported to the United States in recent years?

A. Because it is economical and provides people with more choices.

B. Because the United States is short of food supply.

C. Because Americans need more and more food recently.

D. Because foreign food is of higher quality than native food.

3. Consumers are more concerned about where foods came from because ______.

A. they are curious about the country of the food origin

B. they are particular about the tastes of the food

C. they are concerned about food safety and want to get what they want

D. most of the shoppers are food safety activists themselves

4. The new rules of the country-of-origin labeling law will come into effect ______.

A. right now    B. in a month    C. in three months  D. in half a year        

5. Which of the following can be inferred from the passage?

A. Most Americans prefer imported vegetables to the vegetables grown in local places.

B. The government of America will forbid importing peppers from Mexico.

C. The law was not fully carried out until last week because of food industry’s resistance.

D. Store owners are most likely to be the supporters of the law.

题型:单项选择题

A.条件(1)充分,但条件(2)不充分.
B.条件(2)充分,但条件(1)不充分.
C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
D.条件(1)充分,条件(2)也充分.
E.条件(1)和(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.

[*].
(1)掷两枚均匀的骰子,两骰子点数之和为7的概率为p;
(2)掷两枚均匀的骰子,两骰子点数之数相同的概率为p.

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