问题
选择题
2007年11月11日因海上风暴天气，正在航行的5艘俄罗斯籍船只失事或遇险.其中一艘油轮船体断成两截，约1300吨原油泄入黑海和亚速海之间的刻赤海峡.读图5，回答3-5题.
3．产生刻赤海峡风暴天气的主要气象原因可能是
A锋面和气旋活动 B．飓风活动
C．副极地低气压带上升气流加强 D．反气旋活动
4．海洋石油污染的主要来源是
A类似俄籍船只失事的意外事故 B．沿海地区各类生产活动和交通工具
C沿海地区的工业生产和海运船舶 D．海上石油钻探
5．海洋石油污染产生的主要危害是
A使海洋生态环境遭到破坏 B．使渔业产量大幅度下降
C．使海洋生物多样性锐减 D．使滩涂养殖业产量大幅度下降
答案
3.A
4.C
5.A
1.Secure Net (SN) manufacture security cards that restrict access to government owned buildings around the world.The standard cost for the plastic that goes into making a card is $4 per kg and each card uses 40g of plastic after an allowance for waste. In November 100,000 cards were produced and sold by SN and this was well above the budgeted sales of 60,000 cards.The actual cost of the plastic was $5·25 per kg and the production manager (who is responsible for all buying and production issues) was asked to explain the increase. He said ‘World oil price increases pushed up plastic prices by 20% compared to our budget and I also decided to use a different supplier who promised better quality and increased reliability for a slightly higher price. I know we have overspent but not all the increase in plastic prices is my fault’The actual usage of plastic per card was 35g per card and again the production manager had an explanation. He said ‘The world-wide standard size for security cards increased by 5% due to a change in the card reader technology, however, our new supplier provided much better quality of plastic and this helped to cut down on the waste.’SN operates a just in time (JIT) system and hence carries very little inventory.Required: