设关系R和S的元组个数分别为200和100,关系T是R与S的笛卡尔积,则T的元组个数 发布时间:2018-04-28 19:48 │ 来源:www.tikuol.com 题型:单项选择题 问题: 设关系R和S的元组个数分别为200和100,关系T是R与S的笛卡尔积,则T的元组个数是A.400B.10000C.20000D.90600
题型:单项选择题 从方框中选择最佳选项,完成下列问句的答语。A. it is B. There is C. they are D. there isn'tE. there aren't1. —Are there two desks in the room? —No, ______. 2. —Is there a computer on Miss Li's desk? —No, ______. 3. —Is this your school? —Yes, ______. 4. —Are Tony and Daming behind Kate and Lingling? —Yes, ______. 5. —What's in the picture? —______ a teacher and some students. 1._____ 2._____ 3._____ 4._____ 5._____ 查看答案
题型:单项选择题 柳某与杨某是好朋友,一日杨某告诉柳某自己一笔生意赚了10万元钱,柳某心想自己刚刚赌博还输了10万元钱,心里极不平衡。于是趁杨某不注意,将其10万元钱放入自己的手皮包中。几天后,杨某发现钱不见,立即报了案。而此时,柳某觉得良心不安,对不起自己多年的朋友杨某,于是偷偷把钱放回了杨某家。对于柳某的行为,评价正确的是:A.柳某构成盗窃罪既遂B.柳某构成盗窃罪未遂C.柳某构成盗窃罪中止D.柳某不构成犯罪 查看答案