[单项选择]采用防护热板法测量绝热材料热阻时，以一定的时间间隔测取热流量和温差数据，当连续测得四组读数给出的热阻值的差别不大于（），结果亦可使用。
A. ±0.2%
B. ±0.5%
C. ±1.0%
D. ±1.5%

In 1993, New York State ordered stores to charge a deposit on beverage (饮料) containers. Within a year, consumers had returned millions of aluminum cans and glass and plastic bottles. Plenty of companies were eager to accept the aluminum and glass as raw materials for new products, but because few could figure out what to do with the plastic, much of it wound up buried in landfills (垃圾填埋场). The problem was not limited to New York. Unfortunately, there were too few uses for second-hand plastic.
Today, one out of five plastic soda bottles is recycled (回收利用) in the United States. The reason for the change is that now there are dozens of companies across the country buying discarded plastic soda bottles and turning them into fence posts, paint brushes, etc.
As the New York experience shows, recycling involves more than simply separating valuable materials from the rest of the rubbish. A discard remains a discard until somebody figures out how to give it a second life&m
A. Beverage companies should be responsible for collecting and reusing discarded plastic soda bottles.
B. Throwaways should be collected by the state for recycling.
C. A fee should be charged on used containers for recycling.
D. Consumers had to pay for beverage containers and could get their money back on returning them.