硅纳米线太阳能电池:请问a six-mile formation run和a four-mile minimum road march这两个分别是什么竞赛？

请问a six-mile formation run和a four-mile minimum road march这两个分别是什么竞赛？ 请问Boutrouxé mile是谁? walk-a-mile-in-my-shoes rebuttal a thousand mile 的演唱者是谁？ a six -lane street什么意思 请问six-figure是什么意思啊？？？？ 请问six sigma 是指什么？ what are the six parts in a business letter A;Five oranges,please.B;How _________ are ________ ? A;They're six dollars. He has been married ____ her for six years. A.to B.with 为什么选A