入射光线有可能经过凹透镜的虚焦点吗,如果可以,折射光线如何画.为什么?

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• 入射光线有可能经过凹透镜的虚焦点吗,如果可以,折射光线如何画.为什么?
• 入射光线有可能经过凹透镜的虚焦点吗,如果可以,折射光线如何画.为什么?
• 英语翻译Ceramic varistors based on ZnO–SnO2.求帮忙翻译这个题目的那篇英文文献.以下是摘要AbstractModel ceramic varistor formulations based on 98% ZnO–SnO2(plus 2% oxides of Bi,Co and Mn) were prepared by conven-tional powder processing routes; specimens were sintered at 1150–1275?C.The product density increased with SnO2content,but decreased with increase in sintering temperature.The microstructures contained ZnO,Zn2SnO4spinel and very small bismuth rich phases; with increasing
• 英语翻译Mrs.Hill thought she came from a rich family and never did any (1)h .Her husband (2)h to do all at home though he was (3)b in his office.The man had to do some (4)s in the market on Saturday.Then he cooked for his family and then he did some (5)w .When his wife went to the dances,he began to read his books.He was polite and never (6)m it at all.