我国对外开放的格局是（   ）

降低大气中的二氧化碳的含量，应对温室效应带来的不利影响，是人类的共同责任．下列工程无助于降低大气中二氧化碳含量的是（　　）

    Every year there is a Spring Festival in China. Usually it is in January or February. It is the most important festival in China. So before it comes, everyone has to prepare things. They buy pork, beef, chicken, fruits and many other things. And they often make a special kind of food—“dumplings”. It means “come together”. On the day before the festival, parents buy new clothes for their children. Children also buy presents for their parents. On the Spring Festival Eve（除夕）, all the family members come back to their hometown. This is a happy moment. Some sing and dance，some play cards and others get the dinner ready. When they are having dinner, they give each other the best wishes for the coming year. They all have a good time.

 正确的实验操作是实验成功的关键。请回答：
1) 酒精灯的____焰温度最高，用完酒精灯后，必须用____盖灭。
2）取用一定体积的少量液体除要量筒外，还需要的仪器有____ 。
3）小明同学用托盘天平称了10.4 g NaCl（1 g以下用游码），结果老师检查发现他把药品和砝码的位置颠倒了，他称得NaCl的实际质量为____ g。