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Answer:
1. yes,These are great for demonstrating basic electrostatics. The nub sticking out the top is connected to the stuff in the middle.
2. The copolymer coated aluminum tape is made of calendering aluminium tape with good ductility as the base material, and laminated with single-sided or double-sided composite PE plastic layer or copolymer plastic layer. It can be used without corrugating, or through corrugating to improve bending performance, so as to improve the flexibility of cables / optical cables.
3. ?