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问题 单项选择题

可编程序控制器的逻辑扫描时，程序指令对某些条件进行检查并与输入映象表中的位相比较，条件相符，则逻辑为真，处理器就（）

A、输出控制信号

B、刷新输出映象表中相应的位

C、对相应的输出位置1

D、对相应的输出位清零

答案

参考答案：B

单项选择题

Observe that for the programmer,as for chef, the urgency of the patron（顾客）may govern the scheduled completion of the task,but it cannot govern the actual completion.An omelette(煎鸡蛋),promised in two minutes,may appear to be progressing nicely.But when it has not set in two minutes,the customer has two choices-waits or eats it raw.Software customers have had （）choices.

Now I do not think software（）have less inherent courage and firmness than chefs,nor than other engineering managers.But false（）to match the patron’s desired date is much more common in our discipline than elsewhere in engineering.It is very（）to make a vigorous,plausible,and job risking defense of an estimate that is derived by no quantitative method,supported by little data,and certified chiefly by the hunches of the managers.    Clearly two solutions are needed.We need to develop and publicize productivity figures,bug-incidence figures,estimating rules,and so on.The whole profession can only profit from（）such data.Until estimating is on a sounder basis,individual managers will need to stiffen their backbones and defend their estimates with the assurance that their poor hunches are better than wish derived estimates.

Now I do not think software（）have less inherent courage and firmness than chefs,nor than other engineering managers.

A．testers

B．constructors

C．managers

D．architects
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单项选择题

下列哪项不是电子商务配送中心的特点（）。

A.物流配送反应速度快

B.物流配送手段现代化

C.物流配送流程自动化

D.物流配送过程人工化
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