单项选择题

活化能是反应的动力，活化能越大，则反应速率越快。
A、正确
B、错误

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The price elasticities of supply and demand affect ( ).
A、both the size of the deadweight loss from a tax and the tax incidence
B、the size of the deadweight loss from a tax but not the tax incidence
C、the tax incidence but not the size of the deadweight loss from a tax
D、neither the size of the deadweight loss from a tax nor the tax incidence

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根据夹心墙板的右视图，可以得出结构板的准确( )。
A、宽度
B、高度
C、厚度
D、长度