Synthesis and Function Studies on New Porphyrin Lanthanide Liquid Crystals Compounds.红光发射材料卟啉化合物的合成及其电致发光性能的研究.Lanthanide ions were incorporated through the sol - gel process.在溶胶 - 凝胶过程中引入稀土离子来制备发光材料.The promotion effect...
Cairo has only thirteen square centimetres of green space for each inhabitant.开罗居民的人均绿地面积仅13平方厘米。A thirteen year old girl is being treated after breathing in smoke.一名13岁的小姑娘因吸入浓烟正在接受治疗。Thirteen per cent of Christie'...