用于压力级别比较高的容器,应选用()。 ["对焊法兰","甲型平焊法兰","乙型平焊法兰"]
客户生命周期由哪些阶段组成?各阶段的特点是什么?
新氢机机体部分发生不正常振动的原因是什么?
What should you look at first to compute the number of undo blocks written per second to disk? () ["V$UNDOSTAT","V$TRANSACTION","V$ROLLSTAT","DBA_UNDO_EXTENTS","DBA_ROLLBACK_SEGS"]
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