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【单选题】
合理营养、平衡膳食、适当运动等一系列的日常生活行为属于
A.
基本健康行为
B.
戒除不良嗜好
C.
预警行为
D.
避开环境危害
E.
合理利用卫生服务
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【简答题】(8分)合理利用资源是当今社会关注的热点。 (1)明矾净水,是因为明矾溶于水生成的胶状物, 悬浮于水中的杂质,使水澄清;新型自来水消毒剂ClO 2 可由含钠元素的盐X发生下列反应制取: Cl 2 +2X=2NaCl+2ClO 2 ,则X的化学式为 。 (2)煤燃烧产生的废气里,因含 (填名称),造成酸雨中含硫酸。 (3)煤的气化是一种重要的煤炭资源综合利用技术,其过程如图I所示。合成气中的物质A和...
【单选题】听力原文:M: I have a terrible cold. W: We have quite a few medications to make you more comfortable. What does the woman probably do?
A.
A teacher.
B.
A student.
C.
A doctor.
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A.
decrease
B.
protest
C.
decline
D.
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【简答题】(7分)明矾[化学式为KAl(SO 4 ) 2 ·12H 2 O]是一种常用的净水剂。小华同学为了探究明矾的净水原理,进行了如下实验探究: 【提出问题】明矾为什么能够净水? 【查阅资料】材料一:净水原理是,净水剂具有较大表面积或者净水剂粒子与水反应生成表面积较大的物质,把水中的细小漂浮颗粒吸附到表面,使其密度加大并下沉。 材料二:明矾[KAl(SO 4 ) 2 ·12H 2 O]在水溶液中可以解离...
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【单选题】明矾是一种净水剂,明矾净水的原理是( )
A.
Al 3 + 有较强的吸附性
B.
Al 3 + 与悬浮物生成沉淀
C.
Al 3 + 与水反应生成的氢氧化铝胶体具有吸附性
D.
明矾难溶于水
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