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【单选题】塔式起重机主要部件和安全装置应进行经常性检查，每()不少于一次，并应有记录;使用周期超过()时，应进行一次全面检查，合格后方可继续使用。
A.
周、一个月
B.
月、一年
C.
季、一年
D.
6个月、一年
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【简答题】2005年诺贝尔化学奖授予三位在绿色化学领域有突出成就的科学家，绿色化学核心是实现零排放，而加成反应和化合反应实现了零排放．重氮甲烷在有机合成中有重要应用，可以用来合成甲醚、羧酸、酯类等重要有机产物．重氮甲烷的分子结构可以表示为  CH 2 -N≡N，在其分子中，碳原子和氮原子之间的共用电子对是由氮原子一方提供的． （1）重氮甲烷的电子式为______． （2）重氮甲烷在受热或光照时容易分解放出氮...
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【单选题】听力原文：M: May I help you? W: Yes, I want to buy some shoes to replace the ones I'm wearing. M: What's wrong with them? W: They are too old and shabby. M: I can see they have simply been worn out. Would ...
A.
Similar to what she wears.
B.
A bit uncomfortable.
C.
A little bit dressier.
D.
A little less casual.
查看完整题目与答案
【单选题】听力原文：M: May I help you? W: Yes, I want to buy some shoes to replace the ones I'm wearing. M: What's wrong with them? W: They are too old and shabby. M: I can see they have simply been worn out. Would ...
A.
They were worn out.
B.
They were dirty.
C.
They were of a dull colour.
D.
They were out of style.
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【简答题】深度国际的覅就
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【简答题】A．May I help you? B．What's wrong? C．I'm glad to see you.
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【单选题】听力原文：M: Good morning, may I help you? W: Yes, I'm looking for a light blue sports jacket. Q: Where does the conversation take place? (10)
A.
At a shop
B.
At a restaurant
C.
At a cinema
D.
At the post office
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【单选题】听力原文：W: Hello, University of Sidney. May I help you? M: Yes. I'm looking for information on courses in computer programming. W: Do you want a day or evening course? M: Well, it would have to be an eve...
A.
To inquire about computer programming courses.
B.
To inquire about the time of the lecture.
C.
To buy some computer books.
D.
To open an account.
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【单选题】丁烷分子中,以 C 2 与 C 3 之间的 σ 键为键轴所形成的 4 种构象异构体:( I )对位交叉式;( II )部分重叠式;( III )邻位交叉式;( IV )全重叠式 。 按能量由低到高排序正确的是:( )
A.
（ Ⅰ ）（ Ⅲ ）（ Ⅳ ）（ Ⅱ ）
B.
（ Ⅰ ）（ Ⅲ ）（ Ⅱ ）（ Ⅳ ）
C.
（ Ⅱ ）（ Ⅳ ）（ Ⅲ ）（ Ⅰ ）
D.
（ Ⅳ ）（ Ⅱ ）（ Ⅲ ）（ Ⅰ ）
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【单选题】听力原文：W: City utility department, how may I help you? M: Yes, I'm new here and trying to figure out how garbage and recycle collection work. My understanding is that garbage is collected on Wednesdays,...
A.
House waste collection
B.
Garbage collection times
C.
Recyclable materials
D.
Collection procedures
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相关题目：
【单选题】塔式起重机主要部件和安全装置应进行经常性检查，每()不少于一次，并应有记录;使用周期超过()时，应进行一次全面检查，合格后方可继续使用。
A.
周、一个月
B.
月、一年
C.
季、一年
D.
6个月、一年
查看完整题目与答案
【简答题】2005年诺贝尔化学奖授予三位在绿色化学领域有突出成就的科学家，绿色化学核心是实现零排放，而加成反应和化合反应实现了零排放．重氮甲烷在有机合成中有重要应用，可以用来合成甲醚、羧酸、酯类等重要有机产物．重氮甲烷的分子结构可以表示为  CH 2 -N≡N，在其分子中，碳原子和氮原子之间的共用电子对是由氮原子一方提供的． （1）重氮甲烷的电子式为______． （2）重氮甲烷在受热或光照时容易分解放出氮...
查看完整题目与答案
【单选题】听力原文：M: May I help you? W: Yes, I want to buy some shoes to replace the ones I'm wearing. M: What's wrong with them? W: They are too old and shabby. M: I can see they have simply been worn out. Would ...
A.
Similar to what she wears.
B.
A bit uncomfortable.
C.
A little bit dressier.
D.
A little less casual.
查看完整题目与答案
【单选题】听力原文：M: May I help you? W: Yes, I want to buy some shoes to replace the ones I'm wearing. M: What's wrong with them? W: They are too old and shabby. M: I can see they have simply been worn out. Would ...
A.
They were worn out.
B.
They were dirty.
C.
They were of a dull colour.
D.
They were out of style.
查看完整题目与答案
【简答题】深度国际的覅就
查看完整题目与答案
【简答题】A．May I help you? B．What's wrong? C．I'm glad to see you.
查看完整题目与答案
【单选题】听力原文：M: Good morning, may I help you? W: Yes, I'm looking for a light blue sports jacket. Q: Where does the conversation take place? (10)
A.
At a shop
B.
At a restaurant
C.
At a cinema
D.
At the post office
查看完整题目与答案
【单选题】听力原文：W: Hello, University of Sidney. May I help you? M: Yes. I'm looking for information on courses in computer programming. W: Do you want a day or evening course? M: Well, it would have to be an eve...
A.
To inquire about computer programming courses.
B.
To inquire about the time of the lecture.
C.
To buy some computer books.
D.
To open an account.
查看完整题目与答案
【单选题】丁烷分子中,以 C 2 与 C 3 之间的 σ 键为键轴所形成的 4 种构象异构体:( I )对位交叉式;( II )部分重叠式;( III )邻位交叉式;( IV )全重叠式 。 按能量由低到高排序正确的是:( )
A.
（ Ⅰ ）（ Ⅲ ）（ Ⅳ ）（ Ⅱ ）
B.
（ Ⅰ ）（ Ⅲ ）（ Ⅱ ）（ Ⅳ ）
C.
（ Ⅱ ）（ Ⅳ ）（ Ⅲ ）（ Ⅰ ）
D.
（ Ⅳ ）（ Ⅱ ）（ Ⅲ ）（ Ⅰ ）
查看完整题目与答案
【单选题】听力原文：W: City utility department, how may I help you? M: Yes, I'm new here and trying to figure out how garbage and recycle collection work. My understanding is that garbage is collected on Wednesdays,...
A.
House waste collection
B.
Garbage collection times
C.
Recyclable materials
D.
Collection procedures
查看完整题目与答案
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