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【单选题】
Which of the following statements is true of management information systems?A.
The management information systems discipline had been in existence prior to the invention of the first generation computer.
B.
Management information systems lack the ability to support tactical decision making at the managerial level.
C.
The management information systems discipline draws interest from researchers and practitioners only from the computer science field.
D.
The study of information systems that includes how people, technology, processes, and data work together is called management information systems.
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【简答题】如图所示为一尖顶直动从动件盘形凸轮机构,凸轮以等角速度ω逆时针转动,试给出图中各参数的名称。 (1)以凸轮轴心o为圆心,以其轮廓最小向径r0为半径所作圆,称为凸轮(); (2)凸轮转过Φ角度,从动件从最低位置上升到最高位置,距离为h,则转角Φ称为(),距离h称为(),这个过程称为(); (3)凸轮继续转过Φs,从动件在最远位置处休止,则角Φs称为(); (4)凸轮转过Φ'角度,从动件从下降到离凸轮...
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