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【简答题】
【双缝干涉】一双缝干涉装置,在空气中观察时干涉条纹间距为 1.0 mm 。若整个装置放在水中,干涉条纹的间距将为 ______ mm 。 (设水的折射率为 4/3 ) (小数形式表示)
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【简答题】请将下面的句子改成倒装句 They had hardly heard the news when they rushed out into the street.
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【简答题】A. Fill in each blank with a proper temporal conjunctive (用 时间连词填空,如:just as、when、before、after、while、as soon as、since、once、soon after、until等 ) 。 They had hardly started to work the trouble began.
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【单选题】如图所示,体外除颤仪放置的位置应为
A.
①②
B.
③④
C.
②③
D.
①④
E.
②④
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【单选题】The two men had hardly had time to ________what had happened when they were thrown violently into the sea.
A.
recognize
B.
realize
C.
understand
D.
grasp
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【简答题】B. Fill in each blank with a proper temporal conjunction ( 用时间连词填空 ) 。 After Once when until soon after 1. They kept on working it because completely dark. 2. They had hardly started to work the ...
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【判断题】Friedel-Crafts 烃化反应中烃化剂的活性顺序为: RI>RBr>RCl>RF
A.
正确
B.
错误
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【单选题】Hardly ______ when the door suddenly closed.
A.
they had arrived
B.
they arrived
C.
did they arrive
D.
had they arrived
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【单选题】If they had worked hardly, they die project ahead of time.
A.
will finish
B.
would have finished
C.
have finished
D.
had finished
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【单选题】下列说法不正确的是（）
A.
酰氯和酸酐都可以作为Friedel-Crafts酰基化试剂
B.
Friedel-Crafts烷基化反应中AlCl3,ZnCl2,H3PO4,H2SO4是常用催化剂
C.
卤代烃，烯烃和醇都可以用作Friedel-Crafts烷基化的烷基化试剂
D.
Friedel-Crafts反应是典型的自由基反应
查看完整题目与答案
【简答题】羟乙基化试剂是 A. 卤代烃 B. 环氧乙烷 C. 硫酸二乙酯 D. 芳磺酸酯 2 .常用于制备联芳胺的反应是 A. 乌尔曼反应 B. Friedel -Crafts 反应 C. Dele′pine 反应 D. Gabriel 反应 3 . Williamson 反应的产物是 A. 烃类 B. 酰胺类 C. 酯类 D. 醚类 4 .羰基化合物 α 位 C- 烃化的反应条件是 A. 碱性 B. 酸性...
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相关题目：
【简答题】请将下面的句子改成倒装句 They had hardly heard the news when they rushed out into the street.
查看完整题目与答案
【简答题】A. Fill in each blank with a proper temporal conjunctive (用 时间连词填空,如:just as、when、before、after、while、as soon as、since、once、soon after、until等 ) 。 They had hardly started to work the trouble began.
查看完整题目与答案
【单选题】如图所示,体外除颤仪放置的位置应为
A.
①②
B.
③④
C.
②③
D.
①④
E.
②④
查看完整题目与答案
【单选题】The two men had hardly had time to ________what had happened when they were thrown violently into the sea.
A.
recognize
B.
realize
C.
understand
D.
grasp
查看完整题目与答案
【简答题】B. Fill in each blank with a proper temporal conjunction ( 用时间连词填空 ) 。 After Once when until soon after 1. They kept on working it because completely dark. 2. They had hardly started to work the ...
查看完整题目与答案
【判断题】Friedel-Crafts 烃化反应中烃化剂的活性顺序为: RI>RBr>RCl>RF
A.
正确
B.
错误
查看完整题目与答案
【单选题】Hardly ______ when the door suddenly closed.
A.
they had arrived
B.
they arrived
C.
did they arrive
D.
had they arrived
查看完整题目与答案
【单选题】If they had worked hardly, they die project ahead of time.
A.
will finish
B.
would have finished
C.
have finished
D.
had finished
查看完整题目与答案
【单选题】下列说法不正确的是（）
A.
酰氯和酸酐都可以作为Friedel-Crafts酰基化试剂
B.
Friedel-Crafts烷基化反应中AlCl3,ZnCl2,H3PO4,H2SO4是常用催化剂
C.
卤代烃，烯烃和醇都可以用作Friedel-Crafts烷基化的烷基化试剂
D.
Friedel-Crafts反应是典型的自由基反应
查看完整题目与答案
【简答题】羟乙基化试剂是 A. 卤代烃 B. 环氧乙烷 C. 硫酸二乙酯 D. 芳磺酸酯 2 .常用于制备联芳胺的反应是 A. 乌尔曼反应 B. Friedel -Crafts 反应 C. Dele′pine 反应 D. Gabriel 反应 3 . Williamson 反应的产物是 A. 烃类 B. 酰胺类 C. 酯类 D. 醚类 4 .羰基化合物 α 位 C- 烃化的反应条件是 A. 碱性 B. 酸性...
查看完整题目与答案