题目
The correct description of OR GATE?A. As long as one of the inputs is high, the output is high; Only when all inputs are low, the output is low.B. When all inputs are high, the output is high, otherwise the output is low.C. The output of a NOT gate is the opposite of the input.
The correct description of OR GATE?
A. As long as one of the inputs is high, the output is high; Only when all inputs are low, the output is low.
B. When all inputs are high, the output is high, otherwise the output is low.
C. The output of a NOT gate is the opposite of the input.
题目解答
答案
A. As long as one of the inputs is high, the output is high; Only when all inputs are low, the output is low.
解析
考查要点：本题主要考查对逻辑门（OR Gate）基本特性的理解，需要区分OR门、AND门、NOT门的逻辑关系。
解题核心思路：
- OR门的逻辑规则是“只要有一个输入为高（1），输出即为高（1）；仅当所有输入均为低（0）时，输出才为低（0）”。
- 关键区分点：
- AND门要求所有输入均为高时输出才高，否则输出低。
- NOT门的输出与输入完全相反。
- 通过对比选项与逻辑门规则的匹配性，即可快速锁定正确答案。
选项分析
选项A
描述：只要一个输入为高，输出即为高；只有当所有输入均为低时，输出才为低。
分析：完全符合OR门的逻辑特性，正确。
选项B
描述：当所有输入均为高时输出高，否则输出低。
分析：这是AND门的特性，与OR门无关，错误。
选项C
描述：输出是输入的反面。
分析：这是NOT门的特性，与OR门无关，错误。