Our surroundings are being polluted faster than ever and it seems that people cannot prevent it. Time is bringing us more people, and more people will bring us more industry’, more cars, larger cities, and the growing use of man-made materials.
What can explain and settle this problem The fact is that pollution is caused by man—by his desire (欲望) for a modem way of life. We make "increasing industrialization" (工业化) our first aim. So we are often ready to offer everything: clean air, pure water, good food, our health and the future of our children. There is a constant flow of people from the countryside into the cities, eager for the achievements of our modem society. But as our technological achievements have grown in the last twenty years, pollution has become a serious problem.
Isn’t it time we stopped to ask ourslves where we are going—and why It makes one think of the story about the pilot (飞行员) who told his passengers over th
A. the population of the world is increasing faster
B. people use too many man-made materials
C. we have more industry
D. we are producing more cars, trucks and buses
ABC公司的一种新型产品原有信用政策N/30，每天平均销量为5个，每个售价为750元，平均收账天数40天；公司销售人员提出了新的政策，以便促销产品，新的政策包括改
变信用政策：“2/10，N/50”，同时以每个600元的价格销售，预计改变政策后每天能售出l0个，估计50%的客户会享受折扣，预计平均收账天数仍为40天。若一年按360天计算，企业资本成本率为10%，每个存货的储存成本是100元(其中含存货应计利息)，每次订货成本为144元，该新型产品的每个购买价格为500元。
要求回答以下的问题：
(1)计算公司该产品原有和改变政策后的经济订货量为多少最佳订货次数为多少？
(2)若单位缺货成本为5元，存货从提出到到达，正常交货期为5天，延迟交货1天的概率为0.2，延迟交货2天的概率为0.1，其他均能提前或按照正常交货期送达，则合理的保险储备和再订货点为多少？
(3)若按照前面所确定的经济订货量和再订货点进行采购，综合判断应否改变政策。
A.现场勘察制度
B.B.工作间断、转移制度
C.C.工作终结制度
D.D.恢复送电制度
The mass media is a big part of our culture, yet it can also be a helper, adviser and teacher to our young generation. The mass media affects the lives of our young by acting as a (an) (1) for a number of institutions and social contacts. In this way, it (2) a variety of functions in human life.
The time spent in front of the television screen is usually at the (3) of leisure: there is less time for games, amusement and rest. (4) by what is happening on the screen, children not only imitate what they see but directly (5) themselves with different characters. Americans have been concerned about the (6) of violence in the media and its (7) harm to children and adolescents for at least forty years. During this period, new media (8) , such as video games, cable television, music videos, and the Internet. As they continue to gain popularity, these media, (9) television, (10) public concern and research atte
A. accomplishes
B. fulfills
C. provides
D. suffices
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