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【单选题】
用盐酸溶液滴定Na2CO3溶液的第一、二个化学计量点可分别用( )为指示剂。A.
甲基红和甲基橙;
B.
酚酞和甲基橙;
C.
甲基橙和酚酞;
D.
酚酞和甲基红;
E.
溴甲酚绿—甲基红;
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举一反三
【单选题】While some international couriers are showing signs of exhaustion, EMS (Express Mail Service), the generic name for the courier services of post offices, seems to be finding its stride. Known as Datap...
A.
problems of post offices in Britain
B.
the new courier service — EMS
C.
the competition between private and international courier services
D.
differences between EMS and DHL
【简答题】EMS-express mail serviceA. 邮政快递
【单选题】While some international couriers are showing signs of exhaustion, EMS (Express Mail Service), the generic name for the courier services of post offices, seems to be finding its stride. Known as Datap...
A.
problems of post offices in Britain
B.
the new courier service—EMS
C.
the competition between private and international courier services
D.
differences between EMS and DHL
【单选题】(2017•新课标III卷)下列说法正确的是( )
A.
植物油氢化过程中发生了加成反应
B.
淀粉和纤维素互为同分异构体
C.
环己烷与苯可用酸性KMnO 4 溶液鉴别
D.
水可以用来分离溴苯和苯的混合物
【简答题】丧主显在的消费动机的类型有()型、()型、()型、()型、()型、()型。
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