膨胀罐的用途有哪些？
唐朝实行的两税法产生的实际作用是（）。 ["缓解了严重的土地兼并问题","缓解了均田制破坏所造成的财政问题","减轻了地主对农民的剥削","削弱了藩镇割据的经济基础"]
被动运动是由（）完成的运动；运动时必须克服外界阻力才能完成的运动，称为（）运动。
空速对加氢精制有什么影响？
Your company decided to start using RMAN in its backup strategy. Previously your company used operating system file copies. Which command is used to make RMAN aware of existing backups made by copying files at the operating system？（） ["CHANGE","RESYNC","CATALOG","CROSSCHECK"]
如何正确评价气质的不同类型？
