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【判断题】
万用表使用二极管测试及蜂鸣器的通断性测试时,将黑表笔插入COM插孔,红表笔插入V/Ω插孔(红表笔极性为“+”)将功能开关置于带二极管符号档,将表笔连接到待测导线或线路的两端,如果内置蜂鸣器发出声音,表示两端之间电阻值低于约70Ω。A.
正确
B.
错误
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