Different C60 crystals were synthesized by precipitation from a mixture of the good solvent m-xylene and the poor solven......

In the northern South China Sea,the accumulation of enormous quantities of terrigenous sediment during Cenozoic rendered......

本文探讨了天然赤松母树林的生长发育规律及其更新、种子传播规律。经调查分析：赤松的胸经速生期是第７年开始到２０年，树高速生期是第５年开......