IT服务管理的目标是（） ["服务可量化度量","以客户为中心","实现约定的服务质量和成本","保持与顾客的良好关系"]
You work as a database administrator for Certkiller .com. You received the following error while working on your database： ORA-01555： snapshot too old In which situation would you receive such an error？（） ["You performed rollback after commit.","If a log switch occurs in your database.","Thearchiverfails to generate an archived log file.","Instance recovery fails to find one of the redo log files.","A long-running query is unable to get read-consistent image.","If you perform manual undo management operations in auto mode."]
李先生，因下肢挤压伤致血钾升高，出现心动过缓，心律不齐。应选用的药物是（） ["洋地黄","心得安","利多卡因","5％碳酸氢钠","10％葡萄糖酸钙"]
膨胀/压缩机前、后轴承振动报警为（）停机为（） ["20um，32um","22um，34um","25um，38um"]
对齿轮传动机构的装配技术要求是什么？
何谓小学美术教材？
