Which one is necessary for the activity of respiratory center? 选项：

1.Which one is necessary for the activity of respiratory center?选项： A:afferent signals from the pulmonary stretch receptor.; B:afferent signals from the proprioceptors in the respiratory muscle.; C:certain level of PCO2.; D:certain level of hypoxia.; E:certai level of H+

2.Hypoxia stimulates respiration through选项： A:central chemoreceptors; B:respiratory center in medulla; C:respiratory center in pons; D:peripheral chemoreceptors; E:direct excitation of respiratory muscle.

3.Which one is not the characteristics of epidemiology ?选项： A:Population level; B:Start from the distribution; C:Treatment only; D:Comparision; E:Prevention

4.Causes of respiratory acidosis are as follows except 选项： A、Disease of respiratory muscles B、Obstruction of airways C、Suppression of respiratory center D、Pulmonary disease E、Hysteria

5.The inflation rate is the( ) 选项： A、absolute change in real GDP from one period to another. B、percentage change in real GDP from one period to another. C、absolute change in the price level from one period to another. D、percentage change in the price level from one period to another.

6.Upward communication means __________. 选项： A、sending information from people at a lower level to people at a higher level in an organization B、sending information from people at a higher level to people at a lower level in an organization C、exchanging information with people at the same level in an organization

7.Using data from 20 big cities in China, it has been calculated that the correlation between the level of car ownership and the number of road death is 0.80. Which of the statements shown follow from this?i. There is a strong relationship between the level of car ownership and the number of road deathsii. High levels of car ownership cause high levels of road deathsiii. 80% of the variation in the level of road deaths from one city to the next can be explained by the corresponding variation in the level of car ownershipiv. 64% of the variation in the level of road deaths from one city to the next can be explained by the corresponding variation in the level of car ownership 选项： A、i and ii only B、 ii and iv only C、 ii and iii only D、 i and iv only

8.Which one of the following statements describes a fixed cost? 选项： A、A cost which is easily controlled B、A cost with a total cost value that changes in proportion with the level of activity C、A cost with a constant cost per unit at varying levels of activity D、A cost that is constant in total regardless of the level of activity

9.语法判断With the reflecting elements, an RIS can constructively combine the reflected signals to achieve a high level of energy, and further reconstruct the radio scattering environment into an intelligent one.

10.Among the following factors that affect the price of certain construction land, which one does not belong to the equity factor? ( ) 选项： A、The land use B、The greening level of the area C、Land plot ratio D、Term of land use

11.Among the following factors that affect the price of certain construction land, which one does not belong to the equity factor? ( ) A: The land use B: The greening level of the area C: Land plot ratio D: Term of land use

12.According to the level of fusion operation, data fusion technology levels from low to high is ( ). 选项： A、Decision Leve-->Feature Level-->Data Level B、Data Level-->Feature Level-->Decision Level C、Decision Level-->Data Level-->Feature Level D、Feature Level-->Decision Level-->Data Level

13.The main difference in use of energy between industrial systems and ecosystems shows as 选项： A:Energy flows into both ecosystems and industrial systems from the lowest trophic level; B:Energy may flow into ecosystems and industrial systems from any trophic level; C:Energy flows into ecosystems from the lowest trophic level while into industrial systems from any trophic levels; D:Energy flows into industrial systems from the lowest trophic level while into ecosystems from any trophic levels

14.The identification of transformants obtained by transgenic methods is a comprehensive analysis of whether the transgenic plants have obtained the target traits. From which aspects are usually identified ()? 选项： A、Identification of DNA level B、Identification of transcription level C、Appraisal of translation level D、Phenotyping

15. In Internet consumption, people's needs are developing from high level to low level.

16.Setting up equipment is an example of a: 选项： A:Unit-level activity.; B:Batch-level activity.; C:Product-level activity.; D:Organization-sustaining activity.

17.题目7语法判断With the reflecting elements, an RIS can constructively combine the reflected signals to achieve a high level of energy, and further reconstruct the radio scattering environment into an intelligent one.A. trueB. false

18.According to Maslow's hierarchy of needs theory, the five needs from the lowest level to the highest level are , , , , .

19.Which of the following statements about the respiratory chain is incorrect ?选项： A:The components of respiratory chain are arranged from low potential to high potential.; B:The components of respiratory chain are arranged from low potential to high potential.; C:The electron carriers in respiratory chain are also hydrogen carriers.; D:Electron transfer is accompanied by ADP phosphorylation.; E:Inhibition of cytochrome c oxidase in respiratory chain can block electron transfer of respiratory chain.

20.A civilization is a type of human community or society that has achieved a certain level of culture. 选项： A:正确 B:错误

21.In a means-ends chain, a goal at a lower level ________. 选项： A:is the bridge to a goal at the next higher level B:is attained only after higher level goals are fulfilled C:is separate from the goal at the next higher level D:is ignored if goals at higher levels are attained

22.A 38-year-old female patient suffers from pleurisy and requires pleural fluid sampling (thoracentesis). The attending physician asks you to perform the procedure at the midaxillary line on the right side. Which of the following would be the appropriate level to perform the procedure?选项： A:above the level of the 7th rib; B:at the level of the 10th rib; C:at the level of the 5th rib; D:below the level of the 10th rib; E:between the level of the 8th and 10th ribs

23.Which foundational business performance metrics are derivable from business architecture ? 选项： A:Efficiency , effectiveness and impact B:Efficiency , effectiveness and automation level C:Effectiveness , impact and breadth of coverage D:Automation level , process alignment and effectiveness

24.A ____ cost is a cost which tends to be unaffected by the change in the activity level.

25.Which of the following statements about the user segment of GPS are correct？( )选项： A:They receive signals from visible satellites B:They receive data from multiple satellites C:They do not transmit signals D:They carry accurate atomic clocks

26.Among the following factors, which can determine or influence the interest rate level?选项： A:Average profit margin level ; B:Price level; C:Supply and demand of borrowed capital ; D:International interest rate level; E:Average social profit level; F:Maximum profit level

27.Which one is not belong to the level of economic competition?

Which one is necessary for the activity of respiratory center? 选项： A:afferent signals from the pulmonary stretch receptor. B:afferent signals from the proprioceptors in the respiratory muscle. C:certain level of PCO2. D:certain level of hypoxia. E:certai level of H+

Which one is necessary for the activity of respiratory center?
选项：

A:afferent signals from the pulmonary stretch receptor.
B:afferent signals from the proprioceptors in the respiratory muscle.
C:certain level of PCO2.
D:certain level of hypoxia.
E:certai level of H+