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问题 填空题

（1）分离沸点不同但又互溶的液体混合物，用______法．除去KNO3晶体中少量的KCl所用的方法是______．

（2）现有以下物质①NaCl溶液  ②干冰  ③Na2O固体  ④铜  ⑤BaSO4固体  ⑥蔗糖  ⑦液态HCl  ⑧熔融状态的KNO3，其中属于电解质的是：______，该状态下能导电的是______（填序号）．

答案

（1）分离沸点不同但又互溶的液体混合物，利用蒸馏法，KCl的溶解度受温度影响不大，但KNO3的溶解度受温度影响较大，则除去KNO3晶体中少量的KCl所用的方法是冷却结晶，故答案为：蒸馏；冷却结晶；

（2）水溶液中或熔化状态下能导电的化合物为电解质，则以上几种物质中，只有③⑤⑦⑧为电解质，

存在自由移动的离子或电子的物质能导电，则以上几种物质中只有①④⑧能导电，

故答案为：③⑤⑦⑧；①④⑧．

多项选择题

急性呼吸衰竭气管插管的适应症（）.

A.呼吸不规则

B.呼吸道分泌物多

C.咳嗽反射消失

D.因反射消失

E.昏迷逐渐加深
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填空题

Stress is our response to threatening or (1) events. We may experience different levels of stress depending on the (2) , meaning the events or circumstances that cause us to feel stress. Stressors can be classified into (3) main categories: (4) events, personal stressors, and (5) stressors. Cataclysmic events are major events that cause stress (6) , immediately, for a great many people at once. Personal stressors are major life events that create stress, including (7) life events. Background stressors are (8) hassles, or minor irritations, or (9) background stressors. Repeated exposure to stressors has both psychological and (10) consequences. The long- term consequence is that body tissues such as the heart and blood vessels can begin to (11) . The (12) system functions less effectively, and (13) our ability to fight off illnesses.
The General Adaptation (14) explains the sequence of physiological reactions to stress. There are three phases to G. A. S. The first is the " alarm and (15) " phase: we respond with alarm, and take (16) to remove the stressor. The second phase is the (17) stage: we fight against the stressor or try to cope with the stressor. This can lead to the third phase. (18) . The exhaustion phase may be an (19) way of trying to avoid the stressors. The body may be telling us that we need to do whatever is (20) to remove the stressor.

Stress is our response to threatening or (1) events. We may experience different levels of stress depending on the (2) , meaning the events or circumstances that cause us to feel stress. Stressors can be classified into (3) main categories: (4) events, personal stressors, and (5) stressors. Cataclysmic events are major events that cause stress (6) , immediately, for a great many people at once. Personal stressors are major life events that create stress, including (7) life events. Background stressors are (8) hassles, or minor irritations, or (9) background stressors. Repeated exposure to stressors has both psychological and (10) consequences. The long- term consequence is that body tissues such as the heart and blood vessels can begin to (11) . The (12) system functions less effectively, and (13) our ability to fight off illnesses.
The General Adaptation (14) explains the sequence of physiological reactions to stress. There are three phases to G. A. S. The first is the " alarm and (15) " phase: we respond with alarm, and take (16) to remove the stressor. The second phase is the (17) stage: we fight against the stressor or try to cope with the stressor. This can lead to the third phase. (18) . The exhaustion phase may be an (19) way of trying to avoid the stressors. The body may be telling us that we need to do whatever is (20) to remove the stressor.
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