同时，模型具有良好的开放性，新的电网扰动类型以及扰动带来系统新的问题都可计入模型。
The model has good openness, new types of disturbance and new problem can be included in the model.
历史学科研究性学习具有开放性、主体性、问题探究性、过程性和综合性等特点，其类型则有概括型、归纳型、综合型、比较型、分析型和评价型等几种。
History research study is open, comprehensive and exploratory. It can be divided into the following types: summarizing, inducing, synthesizing, comparing, analyzing and evaluating, etc.
针对工程制图多媒体CAI课件在制作方面存在的一些不足，如适用面窄、类型单一和不可编辑等。提出了如何克服这些弊端，使课件具有开放性的一些建设性的构想。
There are some shortages in the way engineering drawing multimedia CAI courseware are designed and used such as poor flexibility, single type and unedited.
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