为保证长时间潜航，在潜水艇里要配备氧气再生装置，有以下几种制备氧气的方法：
①加热高锰酸钾：
②电解水；
③在常温下过氧化钠固体(Na2O2)与二氧化碳气体反应生成碳酸钠和氧气．
(1)写出③的化学方程式 ____ _____ ．
(2)你认为最适宜的方法是 _________ (填序序号)，与其他两种方法相比，这种方法的两条优点是____ _____、____ _____．
(1) 2Na2O2+2CO2=2Na2CO3+O2；
(2)③； 不需消耗能源； 能将人体呼出的CO2转化为O2，实现CO2和O2之间的物质循环．
For many years, parties have been an important social event. When 25 people or more gather at a certain location in order to have fun and engage in conversation, it can be considered a party. Parties usually have different drinks and food choices, and music is a large part of the event, very often. Birthday parties are held in honor of an individual who is having a birthday, and presents and gifts are usually brought by attendees(出席者).The song “Happy Birthday to You” is very often sung by partygoers for the person who is having a birthday. There are different kinds of Birthday parties. Adults may have birthday parties in restaurants or nightclubs, while children usually have parties at home or at funhouses. Sometimes children may have parties at water parks or amusement parks as well. Birthday parties may also happen in the manner of a surprise party, where the person having a birthday is not told about the birthday preparations. Surprise parties include guests hiding in a location where the party is to take place, then shouting “surprise!” when the guest of honor enters. Sporting event parties usually take place around a specific sports happening, such as the Super Bowl, the World Cup or the World Series. People gather and eat, drink, and laugh as they talk about the happenings of the games within that sporting event. These types of parties are very lively and usually loud. Nightly socialization parties include house parties and dance parties. House parties sometimes are held by teenagers and young adults of college age in a set location; private houses are often the location of choice. People who manage the music are hired to provide musical entertainment. Usually alcohol is included, resulting in trouble for the attendants of the party. Dance parties include energetic music like disco or pop. People gather at these parties to dance, drink, and have a good time. Usually people at these parities will be of younger ages between 18-28.
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