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【简答题】
短文改错。 My name is Deniel. I'm a student. My father is a doctor. My mother is a doctor, either. 1._________. We are from American. But we are now in China. 2._________. Here is an colour picture. It's a picture of my class. 3._________. The women is Miss Chen. She is our Chinese teacher. 4._________. Lin Ping, Wei Fang and Jan is my new friends. 5._________. Jan is from America, too. We like China. We like all our friends here.
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皮皮学刷刷变学霸
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
【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
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