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【单选题】
通过( )不仅可以对相关区域实现实时监视,掌握人员、物资、车辆的流动情况;而且可以及时排除设备故障,保证生产的正常运行,实现生产现场的无人值守。A.
闭路电视监控系统
B.
公务电话系统
C.
广播系统
D.
乘客信息系统
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】下列拓扑结构中，全属于广播式网络的拓扑结构的是（）。 ①星型 ②网状型 ③环型 ④总线型 ⑤卫星通信型 ⑥树型
A.
①②④⑥
B.
①③⑤⑥
C.
③④⑤⑥
D.
②④⑤⑥
【单选题】Name the logic gate that is formed by this circuit.
A.
positive logic OR gate
B.
positive logic AND gate
C.
negative logic OR gate
D.
negative logic AND gate
【单选题】Name the logic gate that is formed by this circuit. ______【图片】
A.
positive logic OR gate
B.
positive logic AND gate
C.
negative logic OR gate
D.
negative logic AND gate
【单选题】Which logic gate is Not gate?
A.
The output of a NOT gate is the opposite of the input.
B.
When all inputs are high(logic 1), the output is high, otherwise the output is low(logic 0).
C.
As long as one of the inputs is high (logic 1), the output is high(logic 1); Only when all inputs are low, the output is low.
D.
If the input is high,the output is also high.
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