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【单选题】
2019 年 9 月 24 日,中国人民银行行长指出:数字货币的目标是替代一部分现金;在技术研发上既可以考虑区块链技术,也可采取在现有的电子支付基础上演变出来的新技术;数字货币如果跨境使用,具有反洗钱、反恐融资、反避税等监管功能。这表明我国的数字货币: 1是央行发行的基于国家信用的法定货币 2将通过增加货币流通量提升货币流通速度 3与虚拟货币、电子支付工具没有本质区别 4能降低传统纸币发行成本,提升交易透明度A.
①③
B.
①④
C.
②③
D.
②④
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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】However, neither matter nor energy is created or destroyed in a chemical reaction.
【简答题】深度为4的二叉树的结点总数最多为()个。
【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
【简答题】What can a catalyst do in a chemical reaction?
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