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【单选题】
欲使 Zn 2+ 与 Fe 3+ 分离,可采用
A.
pH=9 氨缓冲液中通 H 2 S
B.
加入过量 NaOH
C.
加入过量 NH 3 · H 2 O
D.
加入六次甲基四胺
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参考答案：
举一反三
【单选题】关于体液免疫应答的B细胞，下列哪一项错误
A.
B细胞是浆细胞的前体细胞
B.
B细胞活化后可变为记忆性B细胞
C.
B细胞分为Bl细胞和B2细胞两个亚群
D.
B细胞识别的抗原包括TD-Ag和TI-Ag
E.
B1细胞对TI-Ag应答需要Th细胞辅助
查看完整题目与答案
【单选题】关于初次体液免疫应答的说法错误的一项是( )
A.
潜伏期长
B.
生抗体的量少
C.
持续时间短
D.
以IgM和IgG为主
E.
抗原第二次进入机体引起的免疫应答
查看完整题目与答案
【单选题】关于初次体液免疫应答的说法错误的一项是( )
A.
潜伏期长
B.
产生抗体的量少
C.
持续时间短
D.
以IgM和IgG为主
E.
抗原第二次进入机体引起的免疫应答
查看完整题目与答案
【简答题】I. Translate the following sentences from English into Chinese. ( 4*5=20 points ) 46. The kitchen garden was full to overflowing with fresh vegetables. 47. A sheep might easily stumble over a cliff or...
查看完整题目与答案
【判断题】由于楔键在装配时被打入轴和轮毂之间的键槽内,所以会造成轮毂与轴的偏心与偏斜
A.
正确
B.
错误
查看完整题目与答案
【简答题】学测2: In China, safety education is very important now. 46 should students do to keep themselves safe? What are the 47 at school? Take a look. Stampedes(踩踏, earthquakes and fires are the main accidents...
查看完整题目与答案
【简答题】In China, safety education is very important now. 46 should students do to keep themselves safe? What are the 47 at school? Take a look. Stampedes (踩踏 , earthquakes and fires are the main accidents at...
查看完整题目与答案
【简答题】完形填空。 Have you heard of the term 'etiquette' and do you know that etiquette is not only a useful word __ 1 __ very useful to understand? Etiquette is not the same in every culture __ 2 __ in every sit...
查看完整题目与答案
【简答题】V . 完形填空: In China, safety education is very important now. 46 should students do to keep themselves safe? What are the 47 at school? Take a look. Stampedes (踩踏 , earthquakes and fires are the main ac...
查看完整题目与答案
【判断题】由于楔键在装配时被打入轴和轮毂之间的键槽内,所以造成轮毂与轴的偏心与偏斜。
A.
正确
B.
错误
查看完整题目与答案
相关题目：
【单选题】关于体液免疫应答的B细胞，下列哪一项错误
A.
B细胞是浆细胞的前体细胞
B.
B细胞活化后可变为记忆性B细胞
C.
B细胞分为Bl细胞和B2细胞两个亚群
D.
B细胞识别的抗原包括TD-Ag和TI-Ag
E.
B1细胞对TI-Ag应答需要Th细胞辅助
查看完整题目与答案
【单选题】关于初次体液免疫应答的说法错误的一项是( )
A.
潜伏期长
B.
生抗体的量少
C.
持续时间短
D.
以IgM和IgG为主
E.
抗原第二次进入机体引起的免疫应答
查看完整题目与答案
【单选题】关于初次体液免疫应答的说法错误的一项是( )
A.
潜伏期长
B.
产生抗体的量少
C.
持续时间短
D.
以IgM和IgG为主
E.
抗原第二次进入机体引起的免疫应答
查看完整题目与答案
【简答题】I. Translate the following sentences from English into Chinese. ( 4*5=20 points ) 46. The kitchen garden was full to overflowing with fresh vegetables. 47. A sheep might easily stumble over a cliff or...
查看完整题目与答案
【判断题】由于楔键在装配时被打入轴和轮毂之间的键槽内,所以会造成轮毂与轴的偏心与偏斜
A.
正确
B.
错误
查看完整题目与答案
【简答题】学测2: In China, safety education is very important now. 46 should students do to keep themselves safe? What are the 47 at school? Take a look. Stampedes(踩踏, earthquakes and fires are the main accidents...
查看完整题目与答案
【简答题】In China, safety education is very important now. 46 should students do to keep themselves safe? What are the 47 at school? Take a look. Stampedes (踩踏 , earthquakes and fires are the main accidents at...
查看完整题目与答案
【简答题】完形填空。 Have you heard of the term 'etiquette' and do you know that etiquette is not only a useful word __ 1 __ very useful to understand? Etiquette is not the same in every culture __ 2 __ in every sit...
查看完整题目与答案
【简答题】V . 完形填空: In China, safety education is very important now. 46 should students do to keep themselves safe? What are the 47 at school? Take a look. Stampedes (踩踏 , earthquakes and fires are the main ac...
查看完整题目与答案
【判断题】由于楔键在装配时被打入轴和轮毂之间的键槽内,所以造成轮毂与轴的偏心与偏斜。
A.
正确
B.
错误
查看完整题目与答案
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