【简答题】Is there anyone else in your life?
【单选题】Is there anyone in your class ______family is in the country?
【单选题】( 52 )下列关于函数依赖和多值依赖的叙述中,哪些是不正确的? I. 若 X → Y ,则 X →→ Y II. 若 X →→ Y ,则 X → Y III. 若 YcX ,则 X → Y IV. 若 YcX ,则 X →→ Y V. 若 X → Y, Y' c Y ,则 X → Y' VI. 若 X →→ Y , Y' a Y ,则 X →→ Y'
【单选题】Zuò xué wèn yào huā gōngfu, _____________ yǐhéng, rìyī yuèlěi.
【单选题】—The skirt is too expensive; its color is too dark, and... —________. Is there anyone so particular like you?
【单选题】下列哪些条不属于Armstrong公理系统中的基本推理规则? I.若YX,则X→Y II.若X→Y,则XZ→YZ III. 若X→Y,且ZY,则X→Z IV.若X→Y,且Y→Z,则X→Z V.若X→Y,且X→Z,则X→YZ
【单选题】Chị ấy đi lên.....lầu rồi.
【单选题】Is there anyone in your class which family is in the country?
【单选题】设U是所有属性的集合,X、 Y、Z都是U的子集,且Z=U–X–Y。下列关于多值依赖的叙述中,( )是正确的。 I.若X→→Y,则X→Y II.若X→Y,则X→→Y III.若X→→Y,且Y’ Y,则X→→Y’ Ⅳ.若X→→Y,则X→→Z
【判断题】消防、应急设备、一般性安全、载重线和航行安全等六大类内。在这些原因中,救生和消防两缺陷所占比例较大