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【单选题】
根据CCS2017版有机化合物命名原则中系统命名法,写出下列化合物的名称?A.
4-甲基己-3-酮
B.
4-甲基-3-己酮
C.
(R)-4-甲基己-3-酮
D.
(S)-4-甲基己-3-酮
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【单选题】---Are you sure you have to?It 's been very late. ---I don' t know____ I can do it if not now.
A.
where
B.
why
C.
when
D.
how
【简答题】禾本科植物的表皮细胞主要有_______和_______两种类型，除此之外，还有一种大型含水细胞，可能参与叶片的运动，称之为_______。
【简答题】How often do you use your car? Can you use your car less often? Do you know the following facts in the UK? ·About 50% of all car journeys are just for fun. ·Over 80% people go to work by car. ·25% car...
【单选题】If you do not know how to ____you at table in a foreign country, you should copy the host.
A.
dress
B.
tell
C.
show
D.
behave
【单选题】Why did people ask, 'how often can you do this?' in paragraph 4?
A.
They wanted to know if they could attend the next festival.
B.
They were just curious.
C.
They liked it and looked forward to the next festival.
D.
They did not think that it should be held very often.
【多选题】S30408奥氏体不锈钢常用与以下环境( )
A.
设计温度350~550℃的压力容器
B.
设计温高于550℃的压力容器
C.
设计温度低于-70℃的低温用钢
D.
盛装介质为氯化物溶液
E.
介质腐蚀性较强环境和防铁离子污染环境
【简答题】Do you always understand dire c tions on a bottle of medicine? Do you know what is meant by Take only as directed"? Read the following directions and see if you understand them. To reduce pain, t ake ...
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