道岔基本轨垂直磨耗,50kg/m及以下钢轨,在其他线上超过()时,应及时修理或更换。
A. 6mm
B. 8mm
C. 10mm
D. 11mm
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.著名历史学家汉斯•德尔布吕克曾说:“为共和国(注:指魏玛共和国)效劳,但并不喜欢它……我是共和国的开路先锋,但庆祝它,我做不到。”这最能说明()
A. 历史学家也会有思想上的局限性
B. 建立共和国并不代表德国人的利益和愿望
C. 一战后德国的知识分子对共和国持反对立场
D. 当时德国民主共和的社会基础非常薄弱
钢筋混凝土偏心受压破坏通常分为哪两种情况?它们的发生条件和破坏特点是怎样的?
While working on the database, you receive the following error: 01578: ORACLE data block corrupted (file# 6, block # 54) ORA-01110 : data file 6: ’u01/oracle/oradata/data1.dbf’ You decide to recover the corrupted data block by using the Block Media Recovery feature. Which option is NOT a disadvantage of using block media recovery?()
A. Block Media Recovery must be used with RMA
B. You must perform complete recovery of individual blocks.
C. You must have a full RMAN backup, not an incremental backup.
D. You must use the DBVERIFY utility before using the Block Media Recovery feature.