题目

阅读理解 A company in San Francisco, California, hasfound a way to turn used plastic bottles into women's shoes. Every day,millions of Americans drink water and other liquids from plastic bottles. Morethan 60 million of them are thrown away each day. Many of the plastic bottlesend up in landfills or are burned with other waste products. A SanFrancisco start-up company called Rothy's, however, turns this plastic wasteinto environmentally friendly shoes. Roth Martin is the company's co-founder.He explains how they turn plastic into soft material for women's feet. Theytake the plastic, clean 图12-3-3所示的是一列简谐波在某一时刻的波形图象，下列说法中正确的是（    ） 图12-3-3 A.质点A、C、E、G、I在振动过程中位移总是相同 B.质点B、F在振动过程中位移总是相等 C.质点D、H的平衡位置间的距离是一个波长 D.质点A、I在振动过程中位移总是相同，它们的平衡位置间的距离是一个波长