题型:多项选择题 在乳腺模体影像检测中,ACR建议执行的标准是()。A.至少可见4条最大的纤维,3个最大的斑点群,3个最大的块状物B.可见纤维,斑点群和块状物的数量减少不能超过1/3C.模体影像的密度值在1.2~1.6的范围内D.模体影像背景密度标准为1.40,且变化在0.20之内E.对直径1cm,厚度4mm的丙烯酸圆盘而言,其圆盘内外密度差(DD值)标准至少是0.40,变化范围在0.2之间 查看答案
题型:单项选择题 Traditional structured analysis techniques focus upon the flow of (36) within a system. Object-oriented analysis emphasizes the building of real-world models. It examines requirements from the perspective of the classes and objects found in the vocabulary of the (37) domain. Traditional system design method emphasizes the proper and effective structure of a complex system. Object-oriented design method encompasses the process of object-oriented decomposition and a (38) for depicting both logical and physical as well as static and dynamic models of the system under design. Object-oriented programming is a method of implementation in which programs are organized as cooperative collections of objects, each of which represents an (39) of some class, and whose classes are all members of a hierarchy of classes united via (40) relationships.A.markB.pictureC.symbolD.notation 查看答案