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【单选题】
酶催化的反应与无催化剂的反应相比,在于酶能够:
A.
提高反应所需活化能
B.
促使正向反应速度提高,但逆向反应速度不变或减小
C.
降低反应所需的活化能
D.
酶可以催化热力学上不能进行的反应。
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举一反三
【单选题】On the issue of who should be included in the DNB, the writer seems to suggest that ______.
A.
the editors had clear rules to follow
B.
there were too many criminals in the entries
C.
the editors clearly favored benefactors
D.
the editors were irrational in their choices
【简答题】ch6 证明:若关系R是BCNF关系模式,则R是3NF关系模式。
【单选题】— Who is ____ the TV show? She seems to be talented. — Mary Green, who used to be a great actress.
A.
opening
B.
hosting
C.
playing
D.
seeing
【单选题】《旅游法》规定,由于公共交通经营者的原因造成旅游者人身损害.财产损失的,应承担赔偿责任的是____。
A.
地接社,地接社承担责任后可以向公共交通经营者追偿
B.
组团社,组团社承担责任后可以向地接社追偿
C.
地接社和组团社共同承担赔偿责任
D.
公共交通经营者,旅行社应当协助旅游者向公共交通经营者索赔
【单选题】Who are the kinds of reporters the writer seems to admire most?
A.
Reporters who know how to sift through a lot of information.
B.
Reporters who are willing to sacrifice to chase after a story.
C.
Reporters who won't sully themselves.
D.
Reporters who are highly trained.
【单选题】有一溶液,遵守 Lambert-Beer 定律,在 280nm 处,当浓度为 c 时,测得吸收度为 A, 当其浓度分别为下列几种情况时,透光率最大的浓度是( )。
A.
0.5c
B.
1.5c
C.
3c
D.
4.5c
【简答题】Mary is the kind of person who always seems to be ______ a hurry. A) on              B) in           C) with         D) for
【单选题】《旅游法》规定,由于公共交通经营者的原因造成旅游者人身损害、财产损失的,应承担赔偿责任的是 。
A.
地接社,地接社承担责任后可以向公共交通经营者追偿
B.
公共交通经营者,旅行社应当协助旅游者向公共交通经营者索赔
C.
地接社和组团社共同承担赔偿责任
D.
组团社,组团社承担责任后可以向地接社追偿
【单选题】有一溶液,遵守 Lambert-Beer 定律,在 280nm 处,当浓度为 c 时,测得吸光度为 A,当其浓度分别为下列几种情况时,透光率最大的浓度是
A.
0.5C
B.
1.5C
C.
3C
D.
4.5C
【单选题】On the issue of who should be included in the DNB, the writer seems to suggest that ______.
A.
the editors had clear rules to follow
B.
there were too many criminals in the entries
C.
the editors clearly favoured benefactors
D.
the editors were irrational in their choices
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