Which three statements are true about logical structures of the Oracle database（） ["Each segment contains one or more extents.","Multiple tablespaces can share a single data file.","A data block is the smallest unit of input\/output （I\/O） in data files.","It is possible to have tablespaces of different block sizes in a database.","Each data block in the database always corresponds to one operating system block."]
（）击在建筑物附近的大地、其他物体或与建筑物相连的引入设备的闪电。 ["直击雷","非球星雷","球星雷","非直击雷"]
社会保险基金预算、决算草案的编制、审核和批准，依照法律和国务院规定执行。
简述轴与孔的液压套合法。
关于独立离椅子站立，下列描述中正确的是（） ["椅子坐垫软些较好","椅子高些较容易站立","站立前尽量坐于椅子后方","站立前力量较强的足靠前","椅子矮些较容易站立"]
民事诉讼与刑事诉讼有何区别？
