支护的作用有()。
CDE
铁路隧道常用的支护形式为锚喷支护,主要采用锚杆和喷射混凝土、钢筋网片、钢支承等材料,共同组成支护结构承受围岩压力实现施工期安全的目的,同时起控制围岩过大变形的目的。
锚杆的作用有支承围岩、加固围岩、提高岩间摩阻力,形成“组合梁”、“悬吊”作用;喷射混凝土的作用有支承围岩、 “卸载”、填平补强围岩、覆盖围岩表面减缓风化、阻止围岩松动、分配
Withthepublicationof(),TheodoreDreiserwaslaunchinghimselfuponalongcareerthatwouldultimatelymakehimoneofthemostsignificantAmericanwritersoftheschoollaterknownasliterarynaturalism.
Lyingundertheskull,thehumanbraincontainsanaverageoftenbillionnervecellscalled______.
ModernEnglishvocabularydevelopsthroughthefollowingchannelsEXCEPT______.
EzraPound,aleadingspokesmanofthe“()”,wasoneofthemostimportantpoetsinhistime.
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