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● “容器是一个构件，构件不一定是容器；一个容器可以包含一个或多个构件，一个构件只能包含在一个容器中”。根据上述描述，如果用UML类图对容器和构件之间的关系进行面向对象分析和建模，则容器类和构件类之间存在（18）关系。 ?= 1 /* GB3 ① 继承 ?= 2 /* GB3 ②扩展 ?= 3 /* GB3 ③聚集 ?= 4 /* GB3 ④ 包含 （18）A.
= 1 /* GB3 ① ?= 2 /* GB3 ②
B.
= 2 /* GB3 ② ?= 4 /* GB3 ④
C.
= 1 /* GB3 ① ?= 4 /* GB3 ④
D.
= 1 /* GB3 ① ?= 3 /* GB3 ③
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