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Objective To study the status of knowledge, belief and behavior on tobacco and health among staffs in primary and secondary schools and to provide evidence for effectively developing school-based smoking cassation activity.

目的 了解中小学教职工烟草与健康相关知识、信念及行为现状，为有效开展学校控烟健康教育提供依据。

Objective To study the status of knowledge,belief and behavior on tobacco and health among primary school students and to provide evidence for effectively developing adolescent's smoking cassation activities.

目的了解青少年烟草与健康相关知识、信念及行为现状，为有效开展青少年控烟活动提供事实依据。

Objective To study the status of knowledge, belief and behavior on tobacco and health among primary school students and to provide evidence for effectively developing adolescent's smoking cassation activities.

目的 了解青少年烟草与健康相关知识、信念及行为现状，为有效开展青少年控烟活动提供事实依据。

Objective To study the status of knowledge, belief and behavior on tobacco and health among primary school students and to provide evidence for effectively developing adolescent's smoking cassation activities. Methods The questionnaire survey was carried out among the pupils in grade 3-5 from 15 primary schools in Beijing, Shanghai, Tianjin, Shenzhen, Puyang and Changsha.

目的 了解青少年烟草与健康相关知识、信念及行现状，为有效开展青少年控烟活动提供事实依据方法对北京、上海、天津、深圳、濮阳、长沙6所城市随机抽取的15所小学三～五年级学生进行统问卷调查。

Objective To study the status of knowledge,belief and behavior on tobacco and health among staffs in primary and secondary schools and to provide evidence for effectively developing school-based smoking cassation activity.Methods The questionnaire surveywas carried out among the teachers from29primary and secondary schools in Beijing,Shanghai,Tianjin,Shenzhen,Puyang and Changsha.

目的 了解中小学教职工烟草与健康相关知识、信念及行现状，为有效开展学校控烟健康教育提供依据方法对北京、上海、天津、深圳、濮阳、长沙随机抽取的29所中小学教职工进行统问卷调查。

The result indicate that it can effectively catalyze Knoevenagel condensation and can be reused at least two times.

结果表明，聚乙二醇4000支持的哌嗪对Knoevenagel缩合反应具有较好的催化性能，而且可以循环使用多次。

Both and can catalyze effectively the CO oxidation at room temperature.

和 都能在常温下有效催化CO氧化反应。

Both Au 2 and Au 4 can catalyze effectively the CO oxidation at room temperature.

Au 4和Au 2都能在常温下有效催化CO氧化反应。

The catechin in tea could improve the activity of SOD and remove the free radical effectively.

茶中的儿茶素能显著提高 SOD 的活性，清除自由基。

It is because of its chemical purity that tragedy so effectively performs functions of catharsis.

正是由于悲剧的这种化学纯度，它才非常有效地完成着它那净化感情的作用。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。