A.包含(include) B.扩展(extend) C.分类(classification) D.聚集(aggregation)
单项选择题many different () modeling tools
A.internal B.external C.front-end D.back-end
单项选择题broadly supported modeling languages suitable for () usage
A.distinctive B.special-purpose C.separate D.general-purpose
单项选择题This lack of () discouraged new users
A.agreement B.understanding C.characteristic D.diversity
单项选择题minor differences in overall () power
A.control B.expressive C.conductive D.interactive
单项选择题there was no clear leading () language
A.programming B.modeling C.formal D.intelligent