搏出量增多时血压的变化为 A.脉压减小 B.舒张压显著升高 C.收缩压升高明显 D.

题型:单项选择题

问题:

搏出量增多时血压的变化为

A.脉压减小
B.舒张压显著升高
C.收缩压升高明显
D.中心静脉压显著升高
E.收缩压不如舒张压升高明显

考点:临床执业医师生理学血液循环(二)
题型:单项选择题

有A、B、C、D四种钠元素的化合物,其中A、C由两种元素组成,B、D由三种元素组成,已知A、B、C、D分别能跟物质X、Y、Z的溶液发生如下反应:

①A+X→NaNO3+H2O;②B+X→NaNO3+H2O;③C+Y→NaNO3+白色沉淀;④D+Z→NaNO3+白色沉淀;

其中③④步反应所产生的白色沉淀均不溶于硝酸.

(1)请推断并写出下列物质的化学式:A______、B______、X______、Y______;

(2)写出④步反应的化学方程式:______.

题型:单项选择题

按( )因素选择应优先缩短持续时间的关键工作。

A.缩短持续时间对质量和安全影响不大的工作

B.有充足备用资源的工作

C.缩短持续时间所需增加的费用最少的工作

D.缩短持续时间所需增加的工程量最少的工作

E.有充足劳动力的工作

题型:单项选择题

发展和建立高新技术产业最重要的条件是

A.优越的地理位置

B.丰富的自然资源

C.雄厚的科技力量

D.充足的劳动力资源

题型:单项选择题

停车让行牌在通向无人看守道口道路的右侧距道口最外股钢轨不小于5米处。()

题型:单项选择题

阅读理解

     Popeye the Sailor first became a popular cartoon in the 1930s.The sailor in that cartoon ate lots of

spinach to make him strong. People watched him, and they began to buy and eat a lot more spinach.

Popeye helped sell 33 percent more spinach than before! Spinach became a necessary part of many

people's diets. Even some children who hated the taste began to eat the vegetable.

     Many people thought that the iron in spinach made Popeye strong, but this is not true. Spinach does

not have any more iron than any other green vegetable.

     People only thought spinach had a lot of iron because the people who studied the food made a

mistake. In the 1890s, a group of people studied what was inside vegetables. This group said that

spinach had ten times more iron than it did. The group wrote the number wrong, and everyone accepted

it.

     Today, we know that the little iron there is in spinach cannot make a difference in how strong a person

is. However, spinach does have something else which the body needs-folic acid.

It is interesting to point out that folic acid can help make a person strong. Maybe it was really the folic

acid that made Popeye strong all along.    

1. A good title for this reading passage is______.

A. Popeye the Sailor

B. The Truth About Spinach

C.A Mistake with Numbers

D. Folic Acid Makes You Strong

2. Why did many people eat spinach after they saw Popeye the Sailor?

A. They thought spinach made them strong.

B. They thought Popeye was funny.

C. Spinach had a lot of iron.

D. People liked folic acid.

3. A research group told people that spinach______.

A. made Popeye strong

B. was a green vegetable

C. had less iron than other green vegetables

D. had more iron than other green vegetables

4. The reading passage says that perhaps Popeye got his strength from______.

A. iron

B. folic acid

C. spinach

D. exercise

5. Folic acid is ______.

A. something in food

B. a vegetable

C. dangerous

D. a certain kind of spinach

更多题库