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【多选题】
防火墙的作用( )
A.
过滤进出网络的数据
B.
管理进出网络的访问行为
C.
封堵某些禁止的行为
D.
记录通过防火墙的信息内容和活动
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参考答案：
举一反三
【单选题】What are they doing ?
A.
They are taking photos.
B.
They are shooting films.
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【单选题】下列各组物质中互为同系物的一组是
A.
C H 与C H
B.
CH =CH-CH 和CH =CH-CH -CH
C.
乙烯与聚乙烯
D.
与
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【单选题】下列各组物质中，互为同系物的是 [     ]
A.
苯甲醇和苯酚
B.
丙烯和丙炔
C.
甲烷与2－甲基丙烷
D.
乙酸和乙酸乙酯
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【单选题】What are they doing?
A.
They are travel.
B.
They are shopping.
C.
They are takling a story.
D.
They go to the supermarket.
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【单选题】下列物质中与乙烯互为同系物的是 ( )
A.
CH3CH3
B.
CH2=CHCH(CH3)2
C.
C3H6
D.
C4H8
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【单选题】下列各组物质中，互为同系物的是
A.
丁烷与异丁烷
B.
葡萄糖与果糖
C.
乙烷与乙烯
D.
甲烷与丙烷
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【单选题】what are they doing ?
A.
They are taking photos.
B.
They are cutting or editing films.
查看完整题目与答案
【单选题】What are they doing?
A.
they are taking photos
B.
they are cutting or editing films
查看完整题目与答案
【单选题】下列各组物质中，互为同系物的是（　　）
A.
丁烷与异丁烷
B.
葡萄糖与果糖
C.
乙烷与乙烯
D.
甲烷和丙烷
查看完整题目与答案
【单选题】What are they doing?
A.
They are playing computer games
B.
They are playing Fun Facts
C.
they are watching TV
查看完整题目与答案
相关题目：
【单选题】What are they doing ?
A.
They are taking photos.
B.
They are shooting films.
查看完整题目与答案
【单选题】下列各组物质中互为同系物的一组是
A.
C H 与C H
B.
CH =CH-CH 和CH =CH-CH -CH
C.
乙烯与聚乙烯
D.
与
查看完整题目与答案
【单选题】下列各组物质中，互为同系物的是 [     ]
A.
苯甲醇和苯酚
B.
丙烯和丙炔
C.
甲烷与2－甲基丙烷
D.
乙酸和乙酸乙酯
查看完整题目与答案
【单选题】What are they doing?
A.
They are travel.
B.
They are shopping.
C.
They are takling a story.
D.
They go to the supermarket.
查看完整题目与答案
【单选题】下列物质中与乙烯互为同系物的是 ( )
A.
CH3CH3
B.
CH2=CHCH(CH3)2
C.
C3H6
D.
C4H8
查看完整题目与答案
【单选题】下列各组物质中，互为同系物的是
A.
丁烷与异丁烷
B.
葡萄糖与果糖
C.
乙烷与乙烯
D.
甲烷与丙烷
查看完整题目与答案
【单选题】what are they doing ?
A.
They are taking photos.
B.
They are cutting or editing films.
查看完整题目与答案
【单选题】What are they doing?
A.
they are taking photos
B.
they are cutting or editing films
查看完整题目与答案
【单选题】下列各组物质中，互为同系物的是（　　）
A.
丁烷与异丁烷
B.
葡萄糖与果糖
C.
乙烷与乙烯
D.
甲烷和丙烷
查看完整题目与答案
【单选题】What are they doing?
A.
They are playing computer games
B.
They are playing Fun Facts
C.
they are watching TV
查看完整题目与答案
参考解析：
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