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问题 问答题 简答题

过滤刚开始时，为什么滤液总是浑浊的？

答案

参考答案：

开始时滤饼还没有形成，过滤的效果没有达到最佳，实际过滤时要循环一定的时间使滤饼形成致密的结构后滤液就会澄清

单项选择题 共用题干题

Feasibility should be measured throughout the life cycle of system development. The scope and complexity of an apparently feasible project can change after the initial problems and opportunities are fully analyzed or after the system has been designed. Thus, a project that is feasible at one point may become infeasible later. The first feasibility analysis is conducted during the (1). The (2) represents a major feasibility analysis activity since it charts one of many possible implementations as the target for systems design. (3)  is a measure of how well the solution will work in the organization. It is also a measure of how people feel about the system. When it is determined in the later stages of the system life cycle, (4)  is often performed with a working prototype of the proposed system. This is a test of the system's user interfaces and is measured in how easy they are to learn and to use and how they support the desired productivity levels of the users. Economic feasibility has been defined as a cost-benefit analysis. The (5)  technique is a simple and popular method for determining if and when an investment will pay for itself.

空白（3）处应选择（）

A.Operational feasibility

B.Technical feasibility

C.Schedule feasibility

D.Economic feasibility
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单项选择题

下列运算符中不能在C＋＋中重载的是

A) ：
B) +
C) -
D) ＜=
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