问答题

通过对不同时期的所记录上的参数进行比较，可以判断空压机的工作状态是否良好，以及可以确定是否要进行维护保养。

答案： true

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单项选择题

下面关于教学设计的说法中，错误的是（）。 A. 教学设计是一种具有规划、研究、决策性质的过程 B. 教学设计的目的是建构能获得更高的教学效率、教学质量和优化的教/学活动，实现教/学活动的最优化（相对而言），提高教学效果和学习效率 C. 教学设计主要采用形成性评价，不用总结性评价 D. 教学设计的指导理论是关于人类学习心理的学习理论，以及在此基础上建立的被实践证明行之有效的一般教学理论和人类传播活动的科学理论

CAR - CARAVAN ANALOGY
Consider the figure below, which draws the analogy between store-and-forward link transmission and propagation of bits in packet along a link, and cars in a caravan being serviced at a toll booth and then driving along a road to the next tollbooth.

Suppose the caravan has 10 cars, and that the tollbooth services (that is, transmits) a car at a rate of one car per 2 seconds. Once receiving serving a car proceeds to the next tool both, which is 500 kilometers away at a rate of 10 kilometers per second. Also assume that whenever the first car of the caravan arrives at a tollbooth, it must wait at the entrance to the tollbooth until all of the other cars in its caravan have arrived, and lined up behind it before being serviced at the toll booth. (That is, the entire caravan must be stored at the tollbooth before the first car in the caravan can pay its toll and begin driving towards the next tollbooth).
Are there ever two cars in service at the same time, one at the first toll booth and one at the second toll booth?
Choose “正确”if Yes or choose “错误” if No

答案：错误