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【单选题】
卤代 烃在 NaOH 水溶液水解的 反应机理属于 ( ) 。
A.
自由基取代
B.
亲电加成
C.
亲电取代反应
D.
亲核取代
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A.
在 pH 7.0 电泳时，增加了异常血红蛋白向阳极移动的速度
B.
导致异常脱氧血红蛋白的聚合作用
C.
增加了异常血红蛋白的溶解度
D.
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【简答题】Study how Speaker B responds to what Speaker A says. Focus on the words in italics A: it's good to hear that they're thinking of resuming diplomatic relations, isn't it? B: Yes. That’s great. Restorin...
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【单选题】A ________of an effective team is not afraid to question ineffective techniques or strategies. He or she is always trying to improve the team.
A.
thinker
B.
supporter
C.
challenger
D.
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【单选题】You completely disagree with the opinions of a speaker. Which of the following expressions do you think is INAPPROPRIATE to help you in the situation?
A.
I’m afraid I can’t agree with you because ….
B.
I see what you mean, but ….
C.
I think we are digressing a little.
D.
I’m not absolutely sure about what you have said, but I’d suggest….
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【单选题】镰刀形红细胞贫血病患者血红蛋白β链上第六位的谷氨酸被缬氨酸取代后，将产生哪种变化？（高阶）
A.
增加了异常血红蛋白的溶解度
B.
导致异常脱氧血红蛋白的解聚作用
C.
增加了异常血红蛋白向阳极移动的速度
D.
一级结构发生改变
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【单选题】镰刀形红细胞贫血病患者血红蛋白β-链上第六位的谷氨酸被缬氨酸取代后,将产生哪些变化? 1 在pH7.0电泳时,增加了异常血红蛋白向阳极移动的速度 2 导致异常脱氧血红蛋白的聚合作用 3 增加了异常血红蛋白的溶解度 4 一级结构发生改变
A.
① ② ③
B.
① ③
C.
② ④
D.
④
E.
① ② ③ ④
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【单选题】镰刀形红细胞贫血病患者血红蛋白β链上第六位的谷氨酸被缬氨酸取代后,将产生哪种变化?
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增加了异常血红蛋白的溶解度
B.
导致异常脱氧血红蛋白的解聚作用
C.
增加了异常血红蛋白向阳极移动的速度
D.
一级结构发生改变
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【单选题】What message is the speaker trying to convey?
A.
Kids should learn not to be afraid of monsters.
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【多选题】镰刀形红细胞贫血病患者血红蛋白β-链上第六位的谷氨酸被缬氨酸取代后，将产生哪些变化
A.
在 pH 7.0 电泳时，增加了异常血红蛋白向阳极移动的速度
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导致异常脱氧血红蛋白的聚合作用
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增加了异常血红蛋白的溶解度
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【简答题】S1:There is a crossing traffic on our starboard beam,I'm altering the course to starboard side to cross her bow.S2:What will happen if she alters course to starboard? I'm afraid we will take a risk of...
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【简答题】Speaker is afraid of______How does the fear affect him or her? a) She tries to wait and relax. b) She gets off and takes the next one. 2. a) He talks too fast and forgets things. b) He starts...
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【简答题】Study how Speaker B responds to what Speaker A says. Focus on the words in italics A: it's good to hear that they're thinking of resuming diplomatic relations, isn't it? B: Yes. That’s great. Restorin...
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【单选题】A ________of an effective team is not afraid to question ineffective techniques or strategies. He or she is always trying to improve the team.
A.
thinker
B.
supporter
C.
challenger
D.
speaker
查看完整题目与答案
【单选题】You completely disagree with the opinions of a speaker. Which of the following expressions do you think is INAPPROPRIATE to help you in the situation?
A.
I’m afraid I can’t agree with you because ….
B.
I see what you mean, but ….
C.
I think we are digressing a little.
D.
I’m not absolutely sure about what you have said, but I’d suggest….
查看完整题目与答案
【单选题】镰刀形红细胞贫血病患者血红蛋白β链上第六位的谷氨酸被缬氨酸取代后，将产生哪种变化？（高阶）
A.
增加了异常血红蛋白的溶解度
B.
导致异常脱氧血红蛋白的解聚作用
C.
增加了异常血红蛋白向阳极移动的速度
D.
一级结构发生改变
查看完整题目与答案
【单选题】镰刀形红细胞贫血病患者血红蛋白β-链上第六位的谷氨酸被缬氨酸取代后,将产生哪些变化? 1 在pH7.0电泳时,增加了异常血红蛋白向阳极移动的速度 2 导致异常脱氧血红蛋白的聚合作用 3 增加了异常血红蛋白的溶解度 4 一级结构发生改变
A.
① ② ③
B.
① ③
C.
② ④
D.
④
E.
① ② ③ ④
查看完整题目与答案
【单选题】镰刀形红细胞贫血病患者血红蛋白β链上第六位的谷氨酸被缬氨酸取代后,将产生哪种变化?
A.
增加了异常血红蛋白的溶解度
B.
导致异常脱氧血红蛋白的解聚作用
C.
增加了异常血红蛋白向阳极移动的速度
D.
一级结构发生改变
查看完整题目与答案
【单选题】What message is the speaker trying to convey?
A.
Kids should learn not to be afraid of monsters.
B.
Informative speeches can save lives.
C.
Carelessness can result in tragedies.
D.
Firefighters play an important role in America.
查看完整题目与答案