皮皮学,免费搜题
登录
logo - 刷刷题
搜题
【判断题】
Casa Mila, Casa Calvet, Casa Batllo are all works by Antonio Gaudi.
A.
正确
B.
错误
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案:
举一反三
【单选题】Which of the following conditions will make a relation that is in first normal form. to be in second normal form? Ⅰ.every non-key attribute is functionally dependent on the full set of primary key att...
A.
Ⅰ only
B.
Ⅰ and Ⅱ only
C.
Ⅰ and Ⅲ only
D.
any of them
【单选题】第8章本周课堂作业
A.
2018112101
B.
2018112102
C.
2018112103
D.
2018112104
【简答题】请翻译菜名:Bird's Nest Soup
【简答题】以下是某课题组设计的合成聚酯类高分子材料 的路线: 已知: 1A的相对分子质量小于110,其中碳的质量分数约为0.9; 2同一碳原子上连两个羟基时结构不稳定,易脱水生成醛或酮: 3C可发生银镜反应。 请根据以上信息回答下列问题: (1)A的分子式为____; (2)由A生成B的化学方程式为____, 反应类型是____; (3)由B生成C的化学方程式为____, 该反应过程中生成的不稳定中间体的结...
【判断题】First Normal Form Rule that is the relation has not multi-valued attributes, and internal structure attributes.
A.
正确
B.
错误
【单选题】First normal form requires that a database excludes:
A.
foreign keys.;
B.
composite keys.;
C.
duplicate rows.;
D.
repeating groups.
【单选题】测得由反应2S 2 O 3 2- +I 2­­­­­­ →S 4 O 6 2- +2I - 构成的原电池标准电动势为0.445V。已知电对I 2 /I - 的E θ 为0.535V,则电对S 4 O 6 2- /S 2 O 3 2- 的E θ 为( )
A.
-0.090V
B.
0.980V
C.
0.090V
D.
-0.980V
【简答题】PbS是一种可降解的聚酯类高分子材料,可由马来酸酐等原料经下列路线合成: (1)A→B的反应类型是______;B的结构简式是______. (2)C中含有的官能团名称是______;D的名称(系统命名)是______. (3)半方酸是马来酸酐的同分异构体,分子中含1个环(四元碳环)和1个羟基,但不含-O-O-键.半方酸的结构简式是______. (4)由D和B合成PBS的化学方程式是______...
【单选题】_____ around the Water Cube, we were then taken to see the Bird's Nest for the 2008 Olympic Games. [     ]
A.
Having shown
B.
To be shown
C.
Having been shown
D.
To show
【单选题】_______from the top, the 2008 Olympic stadium in Beijing looks just like a bird's nest made of tree branches.
A.
To see
B.
See
C.
Seeing
D.
Seen
相关题目:
参考解析:
知识点:
题目纠错 0
发布
创建自己的小题库 - 刷刷题