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價(jià)格的定義
價(jià)格的定義The Definition of "Price" Prices determine how resources are to be used. They are also the means by which products and services that are in limited supply are rationed ...
美文:星星是怎么樣的?
星星What Are Stars Like? Have you ever wondered about the stars? In some ways stars are like people. They are born. They grow old. And they die. A star is born from dust and gas. Slowly th...
奧巴馬總統(tǒng)譴責(zé)北韓進(jìn)行核試驗(yàn) (2)
"Russia and China as well as our traditional allies of South Korea and Japan have all come to the same conclusion: North Korea will not find security and respect through threats and illegal weap...
異形蚊子(2)
科學(xué)家正在進(jìn)行異形蚊子在抵御瘧疾病流行的研究Marcelo Jacobs-Lorena is with the Malaria Research Institute at Johns Hopkins University in Baltimore, Maryland. Jacobs-Lorena says investigators creat...