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【单选题】
水准仪置于A、B两点中间,A尺读数a=1.525m,B尺读数b=1.307m,仪器移至A点附近,尺读数分别为a′=1.701m,b′=1.462m,则( B )。A.
LL平行于CC
B.
LL不平行于CC
C.
LL平行于VV
D.
LL不平行于VV
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【单选题】In chemical reaction,2CO (g) + O 2 (g) → 2CO 2 (g),which is product?
A.
CO
B.
O 2
C.
CO 2
D.
A+B
【简答题】A chemical reaction is a process that always results in the conversion of reactants into product or products. The substance or substances initially involved in a chemical reaction are called reactants...
【简答题】Which ONE of the following statements is FALSE for a catalyst in a chemical reaction?A. It is an accelerator of the
reaction. B. It is consumed in the reaction. C. It does not affect the equilibrium
o...
【单选题】A catalyst is by definition a substance that increases the rate of approach to equilibrium of a chemical reaction in the reaction.
A.
without being substantially consumed
B.
not at all comsumed
C.
with decreasing significantly
D.
with the change of it ’ s composition
【单选题】In chemical reaction,2CO (g) + O 2 (g)→ 2CO 2 (g),which is reactant ?
A.
CO
B.
O 2
C.
CO 2
D.
A+B
【简答题】What can a catalyst do in a chemical reaction?
【简答题】The substancesthat undergo changes in chemical reaction are called the ,and the new substancesformed are the .
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