我在上第十册第一课“正电和负电”时,发现用橡胶棒和毛皮摩擦使橡胶棒带电的实验效果很不明显,把毛皮放在酒精灯上烤干,用水洗涤橡胶棒后再实验,效果仍然不佳,笔者又用干燥剂放在讲台四周以减少空气湿度,结果还是不尽人意,于是着手找其他东西代橡胶棒实验,结果发现塑料尺、塑料笔杆等塑料制品代替橡胶棒和毛皮摩擦,很快就能 When I was in the tenth lesson of the first lesson “positive and negative electricity”, I found that with a rubber rod and fur friction experiment to charge the rubber rod is not obvious, the fur on the alcohol lamp roasted dry, water after washing the rubber rod Re-experiment, the effect is still not good, I also put desiccant around the podium to reduce the air humidity, the result is still unsatisfactory, then proceed to find other things on behalf of the rubber rod experiment and found that plastic ruler, plastic pen and other plastic products instead of rubber Friction sticks and fur soon