连接操作是从两个关系的笛卡尔积中选取属性间满足一定条件的______。 发布时间：2019-03-26 05:24 │ 来源：www.tikuol.com 题型：填空题 问题： 连接操作是从两个关系的笛卡尔积中选取属性间满足一定条件的______。
题型：填空题 阅读下列短文，根据短文内容完成文后表格中所缺信息，每空一词。 If someone asks me, "Do you like music?" I will answer him or her, "Of course, I do." Because I think music is an important part of our lives. Different people have different ideas about music. For me, I like rock music (摇滚乐) because it's so exciting. And my favourite rock band is Foxy Ladies (酷妹). I also like pop music. My classmate Li Lan loves dance music, because she enjoys dancing. My best friend Jane likes jazz music (爵士乐).She thinks it is really cool."I love dance music and rock very much,"says my brother," because they are interesting." But my mother thinks rock is boring."I like some relaxing (轻松的) music," she says. That's why she likes country music, I think. Dear friends, do you like music? What kind of music do you like? Music—an important part of our lives Different People Different 1______ Reasons I I like 2______ music and pop music Because they are so 3______.Li LanShe loves 4______ music. She 5______ dancing. Jane She likes 6______ music. She thinks it's really 7______. My 8______ He loves dance music and rock.Because they are 9______. My mother She likes 10______ music. She likes some relaxing music 查看答案
题型：填空题 病历摘要：患者男性，25岁，头晕、头痛、乏力，伴血压高5年。体查：BP183/100mmHg（右），173/96mmHg（左），心率80次/分，中上腹部可各闻及血管杂音。辅助检查，血生化：K3.9mmol/L，Na140mmol/L，Cl96mmol/L，空腹血糖6.5mmol/L。直接作用于血管平滑肌，降低心脏前后负荷的药物是（）A.硝普钠B.安体舒通C.哌唑嗪D.酚妥拉明E.硝苯地平F.多巴胺G.巯甲丙脯氨酸 查看答案