抗原抗体反应中,前带现象是指()A.抗原过剩 B.抗体过剩 C.pH的变化而引起 D

题型:单项选择题

问题:

抗原抗体反应中,前带现象是指()

A.抗原过剩

B.抗体过剩

C.pH的变化而引起

D.温度的变化而引起

E.离子强度的变化而引起

考点:临床医学检验二、抗原抗体反应、抗血清及单克隆抗体技术二、抗原抗体反应、抗血清及单克隆抗体技术题库
题型:单项选择题

下列各项,发生在“二战”期间意大利投降至诺曼底登陆之间的是(    )

A.太平洋战场形势发生重大转折

B.苏军攻入德国境内

C.英军取得阿拉曼战役的胜利

D.中、美、英三国政府首脑召开开罗会议

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食醋中含有醋酸,食醋除作调味品外,生活中还有许多妙用,下列使用食醋肯定不能达到目的的是

A.除去菜刀上的铁锈

B.除去水壶壁上的水垢

C.清洗溅到皮肤上的碱液

D.鉴别黄金饰品中是否含有铜

题型:单项选择题

If teens could reduce the salt they take in every day by 3,000 milligrams (mg), they would cut their risk of heart disease and stroke(中风) greatly in adulthood, researchers say.

Based on the results of a computer modeling analysis, researchers found that a 3,000 mg reduction in sodium(钠) by teenagers could reduce hypertension by 30 percent to 43 percent when they become adults.

Hypertension, or high blood pressure, is a common condition that may have no symptoms for years, but can eventually cause serious health conditions, including heart attack and stroke.

Other benefits over time as teens hit 50 years of age include a 7-12 percent reduction in coronary heart disease(冠心病), an 8-14 percent reduction in heart attacks, and a 5-8 percent reduction in stroke.

Fast food typically contains too much sodium. One bag of Nacho Cheese Doritos has 310 milligrams. Pizza is one of the biggest problems for teens when it comes to sodium, according to data from the National Center for Health Statistics.

“The additional benefit of lower salt intake early is that we can hopefully change the expectations of how food should taste, ideally to something slightly less salty,” says Dr. Kirsten Bibbins-Domingo, the lead author of the study and associate professor of medicine at the University of California, San Francisco.

“Most of the salt we eat is not from our salt shaker(盐瓶), but salt that is already added in food that we eat.” she added.

小题1:Which is a benefit of a low sodium diet according to the text?

A.No risk of heart disease.

B.Smaller chance of stroke.

C.Low blood pressure.

D.Slightly more heart attacks.小题2:According to the text, 3,000 mg less salt intake daily will reduce hypertension by ________ in adulthood.

A.7%-12%

B.8%-14%

C.30%-43%

D.5%-8%小题3:What does Dr Kirsten Bibbins-Domingo mean in the last two paragraphs?

A.A lower sodium diet can get teenagers used to less salty food.

B.A good eating habit can help teens have less junk food.

C.Teens should avoid pizzas and other salty foods.

D.We can add more salt from our salt shaker to the food.小题4:Which of the following can be the best title for the text?

A.Teens Cutting Salt for Healthier Adulthood

B.Diet and Health

C.Sodium Brings Health Concerns

D.A Cause of Hypertension

题型:单项选择题

引进设备合同由( )等文件组成。

A.招标文件
B.中标通知书
C.运输提单
D.有关技术规范
E.设备图样

题型:单项选择题

在1千米以下近地层大气中,高度每升高10米()

A.气压升高1.3百帕

B.气压升高1百帕

C.气压下降1.3百帕

D.气压下降1百帕

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