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【判断题】
画半剖视图时,半个视图与半个剖视图应以细实线为界,一半画剖视,一半画视图。A.
正确
B.
错误
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举一反三
【单选题】Which of the followings is NOT the topic of the meetings between the two presidents?
A.
Nuclear weapons.
B.
Terrorism.
C.
Illegal drugs.
【单选题】下列有关 的说法中不正确的是 [ ]
A.
该有机物能发生水解反应
B.
该有机物的化学式为C 19 H 18 N 3 O 2
C.
该有机物不能发生消去反应
D.
该有机物既能与溴水反应，又能与碳酸钠溶液反应
【简答题】设由[0，1]中取n个可测子集E 1 ，E 2 ，…，E n 假定[0，1]中任一点至少属于这n个集中的P个，试证：这n个子集中必有一集，它的测度不小于5。
【单选题】下列有机物中，在不同条件下，既能发生水解反应和消去反应，又能发生酯化反应并能与金属钠反应放出氢气的是( )
A.
只有②
B.
只有①②
C.
只有②③
D.
只有①②③
【单选题】Which of the following is NOT the common feature of eBay and the two new services, WhipCar and RelayRides?
A.
The feasibility of their service is/was doubted of.
B.
All of them serve as an intermediary.
C.
All of them offer auction services.
D.
All of them are operated online.
【单选题】Which is not true about the two families in the text?
A.
They are all very poor.
B.
Each family has four kids.
C.
They live in two cottages.
D.
They often fight with each other.
【单选题】Which of the following is NOT the celebration of the two special days?
A.
Wearing carnations.
B.
Cleaning parents' house.
C.
Visiting the cemetery.
D.
Gathering at home.
【单选题】下列有机物中，不能发生水解的是 A.CH 3 COOCH 3 B. CH 3 CONH 2 C. CH 3 COOH D.A、B、C均不能
A.
CH 3 COOCH 3
B.
CH 3 CONH 2
C.
CH 3 COOH
D.
A、B、C均不能
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