楼上的mm，能给我发一分你的总结吗?
油箱 wusy16888(ａ) 163.com 多谢
没有搜索到……
看到某篇jj里提到有个帖子里沙丘题非常详细`
请帮忙指路
谢谢了><
是十月的机经，我考试的时候就碰到了。引用10月一位考友的JJ:
"第一段談沙丘的形成原因與過程, sand被風吹後，被擋住，停留在某地stagnate後就形成沙丘。
第二段談沙丘的流動(34 or 43度就會流動)。好像還講到流沙什麼的(drift sand) 這裡有題問到which of the following is true according to the passage. 答案是 drift sand何時發生是難以預測的。
第三段比較了seashore 與 desert的沙丘。雖然dryer condition很重要，但也是需要有水份的，moisture."
楼上的mm，能给我发一分你的总结吗?
油箱 wusy16888(ａ) 163.com 多谢
?什么总结啊？如果是GWD—TS我已经上传可以下在了，如果是11月的机经，麻烦GG去看帖吧，因为我自己都没有下载，不好意思：）
祝好：）
Sand dune
There are 4 sections.
The first section: how did the sand dune be formed. The sand was blown by the wind and bounced when they stroke on hard thing (for example rock). If they met soft thing, they would piled gradually and formed a dune. When other sand passed by the top of the dune, the sand is easier to fall. So sand dune has been formed.
The second section: Why does the sand dune move? When the dune is huge enough (namely an angle of the slope face surpasses 30 degree), the sand on the top of slope will collapse. Then the entire sand dunes go forward along the collapsing direction.
The third section mentions an interesting phenomenon that the scientists resemble have not been able to explain--when the dune moved, it made a sound (Moaning). The faster it moves, the louder the sound. (A detail question is here). But some dune does not emit sound at all. Some dunes emits sound now and then (temperamental). (Another detail question, why the sand dune is said to be temperamental).
The fourth section: This kind of moaning has relationship with moisture, generally speaking, when moisture is very high, you cannot hear the dune moaning. But, the author has points out a counter-example, he said that in seashore, the moisture of the sand is high, but it still emits moaning. Why? The scientists explain that the facial interaction between the sand is determined by not only moisture but also the material of the sand. The main ingredient of common sand is quartz, but of seashore sand, is calcification.
谢谢各位如此热心！
鞠躬！><
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