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Japan is getting tough about recycling—and not in the paper and plastic kind of way. Recently, the country requires that all electronic goods—TVs, VCRs, stereos, and more—be recycled. But recycling will not beleft to consumers, instead, the devices will be sent to the original manufacturer for proper disposal. The new law poses a few challenges to manufacturers who are now rushing to set up collection networks and perfecting techniques to disassemble and recycle older products.With an eye toward the future, they are also integrating easily recycled materials into new products. Plastics, a major component of most electronicproducts,pose a particular obstacle because their quality becomes worse and worse with age,losing strengthand flexibility even if reprocessed.NEC Corp. overcomes this problem by creating a plastics sandwich, in which the filling is 100 percent recycled plastic and the outer layers a mixture of 14 percent recycled material.The resulting plastic has sufficient strength and toughness for use as a case for desktop PCs. The company, in cooperation with plastic maker Sumitomo Dow, has also developed a new plastic, which engineers claim retains its mechanical properties through repeated recycling. NEC uses the plastic, which is also flame-retardant (阻燃的) in battery cases for notebook PCs. Meanwhile, Matsushita Electric, maker of the Panasonic brand, is avoiding plastic in favor of magnesium (镁). Magnesium, says the company, is ideal for re cycling because it retains its original strength throughrepeated reprocessing. Matsushita has developed molding techniques to form. magnesium into the case for a 21-inch TV. Unfortunately, the magnesium case and energy-saving features make the TV about twice as expensive as an ordinary model.The company hopes, however, that increased use of magnesium will eventually bring prices down. Choose correct answers to the question: According to the present regulations of Japan, the recycling of paper and plastic will be the responsibility of______. A.the government B.the manufacturers C.the consumers D.the sellers Which of the following is NOT the character of plastics?A.Most electronic products contain plastics. B.It retains its original strength through reprocessing. C.Recycled plastics can be integrated into new products. D.Plastics will lose flexibility after a certain period of time. According to the passage, the term “plastic sandwich” refers to_____.A.a kind of sandwich-shaped toy made of plastics B.a kind of plastics with different integration in each layer C.a kind of plastics with maximum strength and flexibility D.a kind of plastics made of 100% recycled materials In the passage, it is implied but NOT stated that_____.A.disposing the plastics is one of NEC Corp’s businesses B.magnesium is an ideal material for the case of TV C.21-inch TV with magnesium case isn’t very popular so far D.magnesium must be better than the plastics The author writes this passage in order to_____.A.inform B.instruct C.predict D.persuade
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参考答案:
举一反三
【判断题】目前主流的访客对讲系统是数字式联网型的,可视对讲系统。
A.
正确
B.
错误
【单选题】图示同一简支梁的三种受力状态, (a) 梁中点竖向位移等于( )。
A.
(b) 梁中点竖向位移
B.
(b) 梁中点竖向位移的 2 倍
C.
(c) 梁中点竖向位移
D.
(c) 梁中点竖向位移的 2 倍
【简答题】什么是联网型对讲对讲系统?
【判断题】目前主流的访客对讲系统是数码式联网型可视对讲系统。
A.
正确
B.
错误
【判断题】由于审计中的固有限制影响注册会计师发现重大错报的能力,注册会计师不能对财务报表整体不存在重大错报获取绝对保证。特别是,如果被审计单位管理层精心策划和掩盖舞弊行为,注册会计师尽管完全按照审计准则执业,有时还是不能发现某项重大舞弊行为。
A.
正确
B.
错误
【判断题】对PC进行检测,包括检测电源、硬盘和网卡等,应用程序和数据需要进行及时的备份
A.
正确
B.
错误
【简答题】由功的互等定理(第一状态的外力在第二状态的位移上所做的虚功等于第二状态的外力在第一状态的位移上所做的虚功)解决问题。图a所示简支梁在C点作用集中力【图片】时,截面B的角位移【图片】为0.005弧度,则该梁在截面B作用力偶M=2 kN·m时(图b),C点的竖向位移【图片】= 。【图片】
【单选题】商周时代是中国古代( )的典范。
A.
石器
B.
瓷器
C.
家具
D.
青铜
【简答题】创建存储过程,通过输人参数“@学号.@课程编号、@成绩”向xscj中插人-条记录如果已存在相同学号与课称编号的记录.则修改该记录的成绩
【简答题】创建存储过程getDetailByName,通过输人参数“学生姓名”(如“张三”),筛选出该学生的基本信息。对不存在此学生姓名的输人值必须进行检测,并打印信息:“不存在此学生。
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