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【单选题】
已知：R-NH 2 或R 1 —NH—R 2 的性质与NH 3 相似，能与酸反应生成离子化合物。有机物A结构下图所示： 有机物A在稀硫酸中受热会水解成B、C两种产物，B是一种离子化合物，C是一种共价化合物。有关下列说法正确的是（     ）
A.
有机物A的分子式为C 18 H 18 O 2 N 2
B.
C的同分异构体中，属于酚类也属于酯类的化合物有3种
C.
1mol有机物A只能与l mol NaOH发生反应
D.
有机物A的分子式只有2种官能团
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【判断题】“××市关于召开校长工作会议的通知”的标题是正确的。()
A.
正确
B.
错误
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A.
①②
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③④
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①②③
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【判断题】“××市关于召开校长工作会议的通知”的标题是对的。
A.
正确
B.
错误
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【单选题】Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the ...
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He's a secretary.
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D.
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【单选题】辛亥革命后到五四运动前( )。 1中国国内政治斗争的焦点是民主共和与专制复辟的斗争 2民主共和与实业救国是当时社会思潮的主流 3中国民族资本主义工业出现“短暂的春天” 4产生由旧民主主义革命向新民主主义革命转变的因素
A.
①②
B.
③④
C.
①②③
D.
①②③④
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【简答题】食品烤炉按结构形式不同,分为 和 两大类。
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【单选题】听力原文：W: Robert had worked as a secretary for three years. Then he became a newspaperman. After that he started writing novels. M: I know. And he has bean doing nothing else ever since. Q: What is the ...
A.
He's a secretary.
B.
He's a novelist.
C.
He's a newspaperman.
D.
He's a worker.
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相关题目：
【判断题】“××市关于召开校长工作会议的通知”的标题是正确的。()
A.
正确
B.
错误
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【单选题】辛亥革命后到五四运动前中国历史发展的特点是（） ①国内政治斗争的焦点是民主共和与专制复辟的斗争 ②民族资本主义工业出现“短暂的春天” ③民主共和与实业救国成为当时社会思潮的主流 ④出现由旧民主主义革命向新民主主义革命转变的趋势
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【简答题】Correct the errors in the following sentences. 1 They didn't see each other since September. 2) Gina is in college for one year. 3) She has worked at the cafeteria since nine months. 4) He always arri...
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【判断题】“××市关于召开校长工作会议的通知”的标题是对的。
A.
正确
B.
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【单选题】Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the ...
A.
He's a secretary.
B.
He's a novelist.
C.
He's a newspaperman.
D.
He's a businessman.
查看完整题目与答案
【单选题】听力原文：W: Robert had worked as a secretary for three years. Then he became a newspaperman. After that he started writing novels. M: I know. And he has been doing nothing else ever since. Q: What is the ...
A.
He's a secretary.
B.
He's a novelist.
C.
He's a newspaperman.
D.
He's a worker.
查看完整题目与答案
【单选题】楼梯空花栏杆的垂直杆件之间的净距不应大于（）
A.
110mm
B.
120mm
C.
130mm
D.
150mm
查看完整题目与答案
【单选题】辛亥革命后到五四运动前( )。 1中国国内政治斗争的焦点是民主共和与专制复辟的斗争 2民主共和与实业救国是当时社会思潮的主流 3中国民族资本主义工业出现“短暂的春天” 4产生由旧民主主义革命向新民主主义革命转变的因素
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B.
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C.
①②③
D.
①②③④
查看完整题目与答案
【简答题】食品烤炉按结构形式不同,分为 和 两大类。
查看完整题目与答案
【单选题】听力原文：W: Robert had worked as a secretary for three years. Then he became a newspaperman. After that he started writing novels. M: I know. And he has bean doing nothing else ever since. Q: What is the ...
A.
He's a secretary.
B.
He's a novelist.
C.
He's a newspaperman.
D.
He's a worker.
查看完整题目与答案