问题类 meaning in English

question marks

12 chen p p . the entity - relationship model - toward a unified view of data
例如，定义一个问题归约范畴有所有的问题类组成。
W3c recommendation , february 10 , 2004 , http : www . w3 . org tr 2004 rec - owl - features - 20040210 . 14 allen j f . maintaining knowledge about temporal intervals
就问题类的时间或空间复杂性来说，它们之间可以有多项式归约或指数归约。
In the process for doing " generalization " , we make use of the higher arithmetic progression concepts [ 3 ] to deal with the results finally carry out the model of solving the crossing number of network graphs problems , this way may be an originality
在进行观察归纳研究法模式来探讨管线网路设置，其交叉处个数问题类化、一般化的过程中，引进高阶等差级数的理论3来处理所得结果的一般解决模式，乃是一种创意。