题目内容
OOA(Object-Oriented Analysis)模型由5个层次和5个活动组成，5个层次不包括 (33) ，5个活动不包括 (34) 。OOA在定义属性的同时，还要识别实例连接。实例连接是一个实例对象与另一个实例对象的 (35) 关系。 （33）处填（）。
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Driving through snowstorm on icy roads for long distances is a most nerve-racking experience. It is a paradox that the snow, coming (1) gently, blowing gleefully in a high wind, all the while (2) down a treacherous carpet, freezes the windows, (3) the view. The might of automated man is (4) . The horses, the powerful electrical systems, the deep-tread tires, all go (5) nothing. One minute the road feels (6) ,and the next the driver is sliding over it, light as a (7) ,in a panic, wondering what the heavy trailer trucks coming up (8) the rear are going to do. The trucks are like (9) when you have to pass them, not at sixty or seventy (10) you do when the road is dry, but at twenty-five and thirty. (11) their engines sound unnaturally loud. Snow, slush and (12) of ice spray from beneath the wheels, obscure the windshield, and rattle (13) your car. Beneath the wheels there is plenty of (14) for you to slide and get mashed to a pulp. Inch (15) inch you move up, past the rear wheels, the center wheels, the cab, the front wheels, all (16) too slowly by. Straight ahead you continue, (17) to cut over sharply would send you into a slip, (18) in front of the vehicle. At last, there is (19) enough, and you creep back over, in front of the truck now, but (20) the sound of its engine still thundering in your ears. 17（）
对象是面向对象开发模式的 (20) 。每个对象可用它自己的一组 (21) 和它可执行的一组 (22) 来表征。应用执行对象的 (22) 可以改变该对象的 (21) 。 （20）处填（）。
递归算法的执行过程一般来说可先后分成 (57) 和 (58) 两个阶段。 （58）处填（）。
OMT是一种对象建模技术，它定义了三种模型，其中 (49) 模型描述系统中与时间和操作顺序有关的系统特征，表示瞬时的行为上的系统的“控制”特征，通常可用 (50) 来表示。 （49）处填（）。
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