20160113 One question per day
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20160113 Daily Question: 1-3 points for participation; 3-5 points if the answer is correct along with an analysis. For the transmission lines of fire detectors, it is advisable to use insulated wires or cables of different colors. The positive “+” wire should be red, and the negative “-” wire should be ( ). A. Green B. Blue C. Yellow D. Black B
B. Blue~~~~~~~~~~~~~~~~~~~~~~
For the transmission wires of fire detectors, insulated wires or cables of different colors should be selected. The positive “+” wire should be red, and the negative “-” wire should be (B. blue).