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【简答题】
在我国部分白酒中发现塑化剂超标,这些塑化剂是在白酒生产过程中接触塑料部件而带入的。人体摄入超量塑化剂会造成内分泌失调、不育等症。邻苯二甲酸二丁酯(DBP)是一种常见的塑化剂,可由乙烯和邻二甲苯合成。 (1)写出A、C的结构 ; 。 (2)B中含有的官能团名称__________________ (3)写出反应类型:反应① ; 反应③ ; (4)化合物B有多种同分异构体,如果这种同分异构体能与NaHCO 3 溶液反应生成气体,在核磁共振氢谱中只有3处吸收峰,写出其结构 。 (5)写出反应⑥的化学方程式 。
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【单选题】下列有关工程项目周期阶段的说法,正确的是( )。
A.
工程项目准备阶段的主要任务是对工程项目投资的必要性、可行性进行科学论证
B.
工程项目准备阶段投入少,却对工程项目的战略方向起着决定性的作用
C.
工程项目实施阶段包括项目的保修和回访
D.
工程项目试生产正常并经业主验收后,工程项目实施阶段即告结束
【多选题】建立工程项目目标系统时应做的主要工作有( )。
A.
工程项目构思
B.
提出项目申请
C.
建立目标系统
D.
提出项目目标
E.
识别需求
【单选题】It doesn't matter when or how long a person sleeps, but everyone needs some rest to stay alive. That's what all doctors' thought, until they heard about Jercy Page. Jercy Page, it was said, never slep...
A.
large numbers of people do not need sleep
B.
a person was found who actually didn't need any sleep
C.
everyone needs some sleep to stay alive
D.
people can live longer by trying not to sleep
【多选题】下列哪些全国性的法律可以列入基本法附件三而在特别行政区实施?
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领海及毗连区法
B.
国籍法
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合同法
D.
特别行政区驻军法
【单选题】It doesn't matter when or how long a person sleeps, but everyone needs some rest to stay alive. That's what all doctors' thought, until they heard about Jerry Page. Jerry Page, it was said, never slep...
A.
large numbers of people do not need sleep
B.
a person was found who actually didn't need any sleep
C.
everyone needs some sleep to stay alive
D.
people can live longer by trying not to sleep
【单选题】It doesn't matter when or how long a person sleeps, but everyone needs some rest to stay alive. That's what all doctors' thought ,until they heard about Jercy Page. Jercy Page, it was said, never slep...
A.
large numbers of people do not need sleep
B.
a person was found who actually didn't need any sleep
C.
everyone needs some sleep to stay alive
D.
people can live longer by trying not to sleep
【单选题】Everyone needs to have at least eight hours’ sleep a night, so you shouldn’t ______ too late.
A.
give up
B.
stay up
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put up
D.
make up
【单选题】Everyone needs ____ honest. Don't tell lies any more. [     ]
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to
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be
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to be
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【单选题】Which of the following shows that elephants are different from human beings?
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They stay around the dead body for a long time.
B.
Only females stay together for a long time.
C.
The mothers teach their daughters and set a good example.
D.
The older animals would look after the young ones.
【简答题】C It doesn't matter when or how long a person sleeps, but everyone needs some rest to stay alive. That's what all doctors' thought, until they heard about Jercy Page. Jercy Page, it was said, never sl...
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