下列能够改变相对价格结构的是()。
A.社会保障
B.财政补贴
C.财政投资
D.捐赠支出
正确答案是B
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Modern physicists still look mostly at things we can't see. Either very small things in quantum physics or very big things like galaxies. Puting them together is the main problem of modem physics. The universe of space and time described by Einste