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You work as a database administrator for Supportcenter.cn. You are using Recovery Manager （RMAN） for backup and recovery of your database. You executed the delete command in RMAN to delete a backup of a tablespace. Which statement is true in this scenario？（）
提速道岔限位器中π形铁和T形铁之间的间隙为前后各为（）。
经脉病候"是为踝厥"的经脉是（）
游戏一开始，平锋和翔翔就跑到自制区，想制作老师刚刚介绍的“坦克”。在制作“炮筒”时，他们想用吸管插到塑料瓶中当炮筒，可是瓶口粗吸管插入瓶子中马上就掉进去了。平锋说：“那就不要炮筒了。”翔翔说：“那好吧。”这时在一旁观看的老师笑着对他们说：“没有炮筒的坦克怎么发射炮弹呢？”于是两个孩子又重新考虑如何不让吸管掉下去，试了几次，还是不成功，孩子又发出求助的目光，教师没有直接帮助，而是反问幼儿：“为什么吸管会掉下去？用什么办法能让瓶口变细？”孩子们发现了问题，寻找材料，反复尝试，用橡皮泥塞进瓶口，终于取得了成功。结合上述材料，分析教师在游戏活动中的作用。
焊缝探伤所用的组合或阵列式探头各子探头灵敏度相对偏差应不超过4dB。
根据《水利水电工程施工质量检验与评定规程》SL176-2007，关于工程项目划分的基本原则，以下说法正确的是( )。
为什么说"入营尤可透热转气"？
保护箱结构为（）、（）、（）、（）等。
民间组织饮食
网上调查
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