问题
问答题 简答题
除杂净化的对象
答案
参考答案：
液雾，固体微粒，水和杂质。A.除液雾和固体微粒：让气体通过玻璃纤维、碎玻璃管或多空性滤纸。B.干燥：①让气体通过低温阱，使水分被冷冻；②让气体通过干燥剂。C.除氧：粗除（铜屑、氨水和氯化铵的饱和溶液；灼热的铜；焦性没食子酸溶液），细除（活性铜）：D.除氮：各种碱金属、碱土金属及其合金可直接吸附氮气。
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除杂净化的对象
参考答案：
液雾，固体微粒，水和杂质。A.除液雾和固体微粒：让气体通过玻璃纤维、碎玻璃管或多空性滤纸。B.干燥：①让气体通过低温阱，使水分被冷冻；②让气体通过干燥剂。C.除氧：粗除（铜屑、氨水和氯化铵的饱和溶液；灼热的铜；焦性没食子酸溶液），细除（活性铜）：D.除氮：各种碱金属、碱土金属及其合金可直接吸附氮气。
Young people and older people do not agree. 小题1: But in one special programme in New York State, grown-ups and teenagers live together in a friendly way. Each summer 2000 teenagers and 50 grown-ups live together for eight weeks as members of a special work group. Everyone works several hours each day. They do so not just to keep busy but to find meaning and enjoyment in work. Some teenagers work in the woods or on the farms near the villages. 小题2: The grown-ups teach them these skills. There are several free hours each day. Weekends are free, too. During the free hours some of the teenagers learn photo-taking or painting. Others sit around and talk or sing. 小题3: When people live together, rules are necessary. In this program the teenagers make the rules together. If someone breaks a rule, the problem goes before the whole group. They talk about it and ask, “ 小题4: What should we do about it?” One of the teenagers has this to say about the experience. “You stop thinking only about yourself. You learn how to think about the group.”
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