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实验一将新塑料袋铺于平滑的木质桌面上 ,沿垂直于塑料袋底线方向剪下一条长 1 5 cm,宽 3 cm的双层塑膜条 .捏住塑膜条的底线部位 ,平放在桌面上 ,另只手用毛刷单方向在塑膜条上摩擦 3～ 4次 ,再翻过塑膜条使另一面朝上 ,重复刚才的动作 .然后将塑膜条提起 ,会看到两片塑膜条自
In the first experiment, a new plastic bag was laid on a smooth wooden table top and a double plastic film strip 15 cm long and 3 cm wide was cut perpendicular to the bottom line of the plastic bag. The bottom line of the plastic film strip was held flat. On the table, the other hand rubs on the plastic film in one direction with the brush 3 to 4 times, then turns the plastic film strip so that the other side is facing upwards, repeats the previous action. Then lifts the plastic film strip, will see To two pieces of plastic film from