试题与答案

做一做:〔小实验〕探究不同的商品包装材料对环境的影响 试验一:取塑料袋和纸袋各四

题型:填空题

题目:

做一做:〔小实验〕探究不同的商品包装材料对环境的影响

试验一:取塑料袋和纸袋各四个,置于露天土壤上,观察气变化(性状、颜色、气味、及腐烂度等),每个2天做一次记录。

试验二:取塑料袋和纸袋各四个,分别埋于地面以下2米的泥土中60天,观察其变化,每隔10天做一次记录。

试验三:取塑料袋和纸袋各四个,分别置于密封的室内,在室内各放入5只蟑螂和三只蝴蝶。用火柴点燃塑料袋和纸袋,观察其变化(气味、颜色、蝴蝶和蟑螂的反应等)。

预测结果:

试验一:                                       _

试验二:                                          

试验三:                                          

答案:

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参考答案:C解析:本题考查统一建模语言(UML)的基本知识。UML序列图(SequenceDiagram)以二维图的形式显示对象之间交互的图,纵轴自上而下表示时间,横轴表示要交互的对象,主要体现对象间消息传递的时间顺序...

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