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學習快評丨qibao666888　　3月??(yue)26日??(ri)??，我?(wo)國??(guo)高??(gao)速??(su)鐵??(tie)路??(lu)網(wǎng)??(wang)沿??(yan)海??(hai)通??(tong)道??(dao)的??(de)重??(zhong)要??(yao)組?(zu)成??(cheng)部??(bu)分??(fen)——汕??(shan)汕??(shan)高??(gao)鐵??(tie)迎??(ying)來??(lai)新??(xin)進??(jin)展?(zhan)：汕??(shan)頭?(tou)至??(zhi)汕??(shan)頭?(tou)南??(nan)段??(duan)關??(guan)鍵??(jian)控??(kong)制??(zhi)性??(xing)工??(gong)程??(cheng)汕??(shan)頭??(tou)灣??(wan)海?(hai)底?(di)隧??(sui)道??(dao)成??(cheng)功??(gong)貫??(guan)通?(tong)??，這??(zhe)也??(ye)是??(shi)我??(wo)國??(guo)首??(shou)座??(zuo)設?(she)計??(ji)時??(shi)速??(su)350公??(gong)里??(li)、單??(dan)洞??(dong)雙??(shuang)線??(xian)的??(de)高??(gao)鐵??(tie)海??(hai)底??(di)隧??(sui)道??(dao)??。??　　上??(shang)午?(wu)??，隨??(sui)著??(zhe)最??(zui)后??(hou)一??(yi)層??(ceng)巖??(yan)體??(ti)成??(cheng)功??(gong)破??(po)除??(chu)??，“永??(yong)平?(ping)號??(hao)”盾??(dun)構??(gou)機??(ji)順??(shun)利??(li)露??(lu)出??(chu)??，意??(yi)味??(wei)著??(zhe)汕??(shan)頭??(tou)灣??(wan)海??(hai)底??(di)隧??(sui)道??(dao)正??(zheng)式??(shi)貫??(guan)通??(tong)??。?盾??(dun)構??(gou)機??(ji)的??(de)直??(zhi)徑??(jing)達??(da)到??(dao)14.57米??(mi)??，相??(xiang)當??(dang)于??(yu)5層?(ceng)樓??(lou)左??(zuo)右??(you)的??(de)高??(gao)度??(du)??。。