单项选择题

对于如图4-3所示的UML类图，正确的描述是（）

A．类O的实例中包含了对类P的实例的引用
B．类O的实例中包含了对类Q的实例的引用
C．类P的实例中包含了对类O的实例的引用
D．类P的实例中包含了对类Q的实例的引用

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单项选择题

DBMS will manage the stored data items and assemble the needed items from the (72) database in response to the queries of those who aren't programmers.

A．particular
B．the same
C．common
D．extention

单项选择题

One important difference is that an ActiveX control must be (74) for a specific platform, while an applet is platform-independent.

A．transactioned
B．compiled
C．created
D．identitied

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