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【单选题】
酶具有高度催化能力的原因是A.
酶能提高反应物分子的活化能
B.
酶能催化热力学上不能进行的反应
C.
酶能降低反应的活化能
D.
酶能改变化学反应的平衡点
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举一反三
【单选题】What refers to the depth of a petroleum product in a tank ________．
A.
Innage
B.
Outage
C.
Thievage
D.
Ullage
【单选题】What does Shell plan to do?
A.
Shell plans to cooperate with PetroChina in Nanhai Petroleum Chemical project.
B.
Shell plans to cooperate with PetroChina in the north-east gas transmission project.
C.
Shell plans to cooperate with China National Offshore Oil in Nanhai Petroleum Chemical project.
D.
Shell plans to cooperate with PetroChina in the west-east gas transmission project.
【单选题】下列水溶液沸点最低的是( )。
A.
0.01mol·dm -3 NaNO 3
B.
0.01mol·dm -3 HAc
C.
0.01mol·dm -3 BaCl 2
D.
0.01mol·dm -3 C 6 H 12 O 6
【单选题】—________________ —They’re books.
A.
Are these English books?
B.
What’s this?
C.
What’re these ?
【简答题】看图写句子。 1. A: What are they doing? B: They're ____________. 2. A: What ___________? B: They're _____________. 3. A:______________________? B:_______________________. 4. A:_______________________? B:___...
【简答题】What is petroleum refining?
【简答题】看图写句子。 A: What's it doing? B: It's __________. A: What are ____________? B: They're _________________. A: What are ___________? B: They're _____________. A: What _____________? B: They're __________.
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