The origin of hydroelectric power is the ______ produced when water obeys the laws of gravity.
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Why is the price system very complicated?
Because everything seems to ______else.
我国的城乡收入差别很大,但是城乡储蓄倾向的差别却不大。()
储蓄者购买投资者发行的各种证券, 相应的把投资者相应的资源用于生产能力的建设时, 金融化的发展会推动经济的发展。()