The class question of the teacher and the scum teacher asked: "How can I tell which wire is a wire and which is a copper wire?" Physicist said: "The material is different, the resistance is different, and the resistance experiment can be distinguished." "Chemistry

Bully and scum

The teacher's class asked: "How can I tell which wire is a wire and which is a copper wire?" ”

Physicist Bully said: "The material is different, the resistance is different, and the resistance experiment can be distinguished." ”

Chemistry bully said: "Do hydrochloric acid reaction experiments, observe different reaction phenomena, you can distinguish." ”

The scum said, "I... Look at the color, the black is the wire, the yellow is the copper wire..."