题目内容

透视图

A. side elevation
B. back elevation
C. perspective drawing
D. bird’s-eye view

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Translate the following paragraph into Chinese.Building Information Modeling(BIM) is a digital representation of physical and functional characteristics of a facility. A BIM is a shared knowledge resource for information about a facility, forming a reliable basis for decision during its life-cycle from earliest conceptual stages, through design and construction, through its operationaI life and eventual demolition.

集电极开路门（OC门）在使用时，输出端应通过电阻接（）

A. 地
B. 电源VCC
C. 输入端
D. 都不是

欲将两输入的与非门作反相器非门使用，其输入端接法不对的是。

A. 将逻辑变量接入某一输入端，多余端子接电源
B. 将逻辑变量接入某一输入端，多余端子接地
C. 将逻辑变量接入某一输入端，多余端子与输入端并联使用

三态门三种可能的输出状态是高电平、低电平、高阻态。()

A. 对
B. 错