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【单选题】
PH 对酶促反应速度的影响,下列哪对的A.
PH 对酶促反应速度影响不大
B.
不同酶有其不同的最适PH
C.
酶的最适PH 都在中性即7左右
D.
酶的活性随PH 的增高而增大
E.
PH 对酶促反应速度影响主要在于影响该酶的等电点
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举一反三
【单选题】According to the author, where does the happiness of scientists lie?
A.
It lies in a sense of fulfillment.
B.
It lies in their rich imagination.
C.
It lies in the increase of their knowledge.
D.
It lies in the opportunity to continue the search.
【单选题】Happiness is contrasted with eye color because happiness __________.
A.
does not have a color
B.
is not physical
C.
cannot be seen
D.
may not last
【单选题】According to the author, where does the happiness of scientists lie?
A.
It lies in a sense of fulfillment.
B.
It lies in their rich imagination.
C.
it lies in the increase of their knowledge.
D.
It lies in the opportunity to continue the search.
【单选题】鼠痘典型特征为 ,严重者可见脚、尾坏死脱落( )
A.
常突然倒地,抽搐,尖叫后死亡
B.
发热、咳嗽、厌食、精神萎顿
C.
脚、尾和鼻部出现皮疹和溃疡
D.
出血性腹泻、呕吐,眼和鼻有分泌物,呼吸困难
【单选题】In the world of the comics, happiness depended on______.
A.
a crazy sense of humor
B.
a love of life
C.
a little faith and luck
D.
cunning and courage
【单选题】The Greek philosopher Aristotle said that a persons highest happiness comes from the use of his or her intelligence. Religious books such as the Koran and Bible discuss faith as a form. of happiness. ...
A.
the importance of happiness
B.
the cause of happiness
C.
the meaning of happiness
D.
people who are happy
【单选题】I want to ________ the secrets of nature and apply them for the happiness of man.
A.
bring in
B.
bring out
C.
bring up
D.
bring about
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