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【单选题】
采用不可调值总价合同时,由发包方承担的是( )风险。
A.
设计和工程范围变更
B.
地质条件不利
C.
通货膨胀
D.
施工质量不良
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【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...
【单选题】Eco-travel is a form of travel _____ combines normal tourism with learning, _____ a way to find out what can be done to help animals, plants and people. [     ]
A.
what; as well as
B.
that; as well
C.
which; as well as
D.
which; as well
【单选题】下列哪种船闸的闸首口门宽度小于闸室宽度()
A.
广厢船闸
B.
单线船闸
C.
竖井式船闸
D.
内河船闸
【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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