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近年来，政府大力投资改善学校的办学条件，并切实加强对学生的安全管理和安全教育．某中学新建了一栋教学大楼，进出这栋教学大楼共有2道正门和2道侧门，其中两道正门大小相同，两道侧门大小也相同．安全检查中，对4道门进行了测试：当同时开启一道正门和一道侧门时，4分钟内可以通过800名学生；当同时开启一道正门和两道侧门时，3分钟内可以通过840名学生． （1）求平均每分钟一道正门和一道侧门分别可以通过多少名学生？ （2）检查中发现，紧急情况时因学生拥挤，出门的效率将降低20%，安全检查规定：在紧急情况下，全大楼的学生5分钟内通过这4道门安全撤离．假设这栋教学大楼的教室里最大有1500名学生，试问建造的这4道门是否符合安全规定？请说明理由．
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举一反三
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C.
、风险型决策
D.
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A.
Three lobes in the left lung
B.
The surface is covered by parietal pleura
C.
The oblique fissure could be found in both lungs
D.
Cardiac notch locates in the right lung
E.
The pulmonary vein connect with left ventricle
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【单选题】Inhalation of air into the lungs is correctly described by which of the following?
A.
the action of the diaphragm and the ribs create a positive pressure in the thoracic cavity which causes air to move into the lungs.
B.
the volume of the thoracic cavity is increased as muscles relax, thus increasing the pressure and air is forced into the lungs.
C.
the thoracic cavity decreases in volume as muscles relax and pressure decreases so external air is forced into the lungs.
D.
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A.
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B.
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A.
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B.
The right lung is in direct contact with the arch of the aorta and the descending thoracic aorta.
C.
Inhaled foreign bodies most frequently enter the right lung.
D.
The structure of the lungs receives its blood supply from the pulmonary arteries.
E.
The costodiaphragmatic recesses are lined with visceral pleura.
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B.
C.
D.
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B.
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C.
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【单选题】Inhalation of air into the lungs is correctly described by which of the following?
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the action of the diaphragm and the ribs create a positive pressure in the thoracic cavity which causes air to move into the lungs.
B.
the volume of the thoracic cavity is increased as muscles relax, thus increasing the pressure and air is forced into the lungs.
C.
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D.
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查看完整题目与答案
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A.
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B.
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C.
公平原则
D.
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查看完整题目与答案
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【单选题】处理改革、发展、稳定关系的重要结合点是（）
A.
不断改善人民生活
B.
正确处理人与自然的关系
C.
密切党和群众的关系
D.
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【判断题】我国操作系统仍旧是微软的windows，尚未实现安全主导。
A.
正确
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【单选题】Which of the following statements concerning the lungs is correct?
A.
There are no lymph nodes within the lungs.
B.
The right lung is in direct contact with the arch of the aorta and the descending thoracic aorta.
C.
Inhaled foreign bodies most frequently enter the right lung.
D.
The structure of the lungs receives its blood supply from the pulmonary arteries.
E.
The costodiaphragmatic recesses are lined with visceral pleura.
查看完整题目与答案
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