freepeople性欧美熟妇, 色戒完整版无删减158分钟hd, 无码精品国产vα在线观看DVD, 丰满少妇伦精品无码专区在线观看,艾栗栗与纹身男宾馆3p50分钟,国产AV片在线观看,黑人与美女高潮,18岁女RAPPERDISSSUBS,国产手机在机看影片

正文內(nèi)容

都江堰英文導(dǎo)游詞范文3篇-wenkub.com

2025-08-24 02:49 本頁(yè)面
   

【正文】 Weir, dam. This is the origin of the name, dujiangyan, I hope you remember this the ancestor of water conservancy project. Don39。s life in the use of water, in flood period to prevent the onset of flooding, really. , of course, there are few small islands and baizhang dike, abatis, Jin Gangdi assistance, fish mouth could not plete the task perfectly, it also tells us that in life, we also need friends helping each other. Now we ran down a stand fly sand dam spillway. Fly sand dam with xie hong, desilting and adjust the significant function of water, mainly in the flood will BaoPingKou redundant outside the inner river water to the river, if there are any flooding, it will own levee breaches, let the water flow into the spillway, make a lot of regression of minjiang river flow, to ensure that people in chengdu is not affected by the flood disasters. The second function is desilting, when water gallop, due to centrifugal force formed by the vortex, the sediment or washed up, or to the spillway, the excess of sediment discharge into the river. Ancient sand dam, it is to use bamboo cage gravel pile of temporary works。下面是為大家?guī)?lái)的都江堰英文導(dǎo)游詞,希望可以幫助大家。 都江堰英文導(dǎo)游詞范文 1: Dear visitors, everybody is good! Wele to dujiangyan city sightseeing. Today, I have the honor to serve as your guide. Now please follow me. Please note: please don39。 Now switch to concrete casting, in order to protect the effect of once and for all. The following is our last stop BaoPingKou. BaoPingKou named after the deep image vase, gate role, can automatically control the neijiang into the water, is extended to the minjiang rive
點(diǎn)擊復(fù)制文檔內(nèi)容
合同協(xié)議相關(guān)推薦
文庫(kù)吧 www.dybbs8.com
備案圖片鄂ICP備17016276號(hào)-1