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问题 单项选择题

图（a）所示电路中，复位信号、信号A及时钟脉冲信号cp如图（b）所示，经分析可知，在第一个和第二个时钟脉冲的下降沿时刻，输入Q分别等于（）

附：触发器的逻辑状态表为：

A.0,0

B.0,1

C.1,0

D.1,1

答案

参考答案：D

单项选择题

（）analysis emphasizes the drawing of pictorial system models to document andvalidate both existing and/or proposed systems. Ultimately, the system models become the（）for designing and constructing an improved system. （）is such a technique. Theemphasis in this technique is process-centered. Systems analysts draw a series of processmodels called （）. （）is another such technique that integrates data and processconcerns into constructs called objects.

（）is another such technique that integrates data

A．Structured analysis

B．Information Engineering

C．Discovery Prototyping

D．Object-Oriented analysis
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单项选择题

安全装置不齐全、不完好、动全不灵敏或有失效者（）；

A、可以吊

B、不吊

C、根据情况

D、起重机安全作业
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