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九年义务教育三年制初中物理第一册p.131练习第1题;“把塑料挂衣钧紧贴在光滑的墙上(图11—7),就能用它挂衣服或书包,这是为什么?”某市1997年初中毕业暨升学考试物理试题第20题,就是将此题略加改动,编成选择题为:“把塑料挂衣钧(如图)与课本图11—7相同的吸盘 紧贴在光滑的墙上,就能用它挂衣服或书包,在解释这个现象时要用以下四句话
Nine-year compulsory education three-year junior high school physics first volume p.131 practice question 1; “Put plastic clothes close to a smooth wall (Figure 11-7), you can use it to hang clothes or school bags, Why is it?” The 20th question in the physical examination of a city’s middle school graduates and graduating entrance examinations in 1997 was the slightest change in this question, and the multiple-choice questions were: “The plastic hangers (pictured) are the same as the textbooks in Figure 11-7. The sucker is close to the smooth wall and you can use it to hang clothes or school bags. Use the following four sentences to explain this phenomenon: