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与北方针叶林相比，热带雨林的植物种类组成通常较简单。 ( )
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一般分析出现质量问题时，应该从哪几个方面去思考原因
在一定空间范围内同一物种所有个体的集合称为______。
所有进出我国关境从事商业性国际运输的船舶必须缴纳船舶吨税。( )
Announcement on Beijing Olympic Volunteer Slogan Solicitation (征集)Ⅰ. Starting and ending dates The open solicitation starts from March 31 and ends on August 31, 2006Ⅱ. Requirements of the slogan1.Highly summarizing the concept of Beijing Olympic Volunteer Program — "service first and harmony first" and highlighting the striking feature of the times and the Chinese culture throughout the Beijing Olympic Games.2. Clearly reflecting the idea that "Volunteers’ smiles are the best name card of Beijing".3. Carrying international flavor and catering to the world so that people from different countries and regions and of various cultural backgrounds can understand and accept it. Both the Chinese version and the English one should be equally impressive.4. Being brief, rhythmic, easy to remember, inspiring and appealing. What does the slogan highlight The striking feature of the times and ______.
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