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【单选题】
按《铁路工程地质勘察规范》（TB10012—2001），下列对隧道进行围岩分级的确定方法中，哪一选项不正确（）A.
岩石坚硬程度及岩体完整程度是隧道围岩分级的基本因素
B.
当隧道涌水量较大时，基本分级Ⅰ～Ⅴ级者应对应修正为Ⅱ～Ⅵ级
C.
洞身埋藏较浅，当围岩为风化土层时应按风化层的基本分级考虑
D.
存在高地应力时，所有围岩分级都要修正为更差的级别
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