Pollution control should start with banning pollution sources; Human beings should have a global village view, and pollution control should be coordinated globally; Rational use of chemical substances; Science plays a decisive role in preventing and controlling pollution; Pollution control takes a long time and costs a lot; Chemistry is a double-edged sword, which can not only benefit mankind, but also bring disaster to mankind. The structure of Zn-Mn dry battery takes the central carbon rod (graphite) as the positive electrode and the peripheral zinc tube as the negative electrode. Manganese dioxide and graphite mixed with ammonium chloride solution (as electrolyte) are filled between zinc cylinder and carbon rod, and graphite does not participate in chemical reaction, but only plays a conductive role. During the use of the battery, zinc gradually becomes zinc chloride. (2) black powder is filled around the electrode; ③ There are a few colorless crystals; ④ The metal shell is obviously damaged. This problem is based on zinc-manganese dry battery, which has the characteristics of multi-angle investigation, discrete knowledge and relatively open knowledge.
Therefore, the answer is: (1) Copper and zinc (2) are beneficial to the recycling of waste and prevent manganese dioxide and paste-like substances from polluting the environment.