问题
单项选择题 A1/A2型题
单位距离（1cm）内，所含铅条数称为（）
A.栅比
B.栅焦距
C.栅密度
D.铅容积
E.焦栅距离界限
答案
参考答案：C
解析：单位距离（1cm）内，所含铅条数称为栅密度。
搜题请搜索小程序“爱下问搜题”
单位距离（1cm）内，所含铅条数称为（）
A.栅比
B.栅焦距
C.栅密度
D.铅容积
E.焦栅距离界限
参考答案：C
解析：单位距离（1cm）内，所含铅条数称为栅密度。
Some people believe that greed and selfishness has become the basis of modern society, and we should return to the old traditions of family and community, then we will have a better life. To what extent do you agree or disagree with the above opinion? In this fast-paced world, many values are undergoing major changes. While people traditionally prioritize caring, sharing and generosity in life and work, modern people seem to be more self-absorbed and self-concerned. Modern people act selfishly to survive the harsh competition of life. They say that it is a jungle out there. To survive, you have to fight with whatever means that come handy. Obviously greed and selfishness go perfectly well with such ideas. In a company, employees do everything they can to get better pay and higher position, even at the cost of colleagues. We are in any way advocating（拥护）any selfish conduct. It is just that people are pressured to behave in a different way due to outside influences. Are we happier to share with others and be generous to them? There is no fixed answer, either. Some people take great pleasure helping and giving to others while others feel happy doing the opposite. But I personally think that people should not be too selfish. Caring for others can actually encourage the development of a friendly relationship. In conclusion, modern people appear to be more self-centered than those in the past due to strong outside pressure. However, we should encourage people to know the importance of being caring and generous and to build a friendly relationship with others. Are modern people becoming more selfish?
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