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【简答题】
在测量周期时的主要误差有：（）和（）。通用计数器采用较小的（）可以减小±1误差的影响。
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举一反三
【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】However, neither matter nor energy is created or destroyed in a chemical reaction.
【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?
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