现有以下物质①NaCl溶液②干冰(固态的二氧化碳)③冰醋酸(纯净的醋酸)④铜⑤BaSO4固体⑥蔗糖⑦酒精⑧熔融的KNO3,其中属于电解质的是:____ ,属于非电解质的是____ ,能导电的是____ .(填写序号)
根据短文内容回答下列问题。
Why do you remember Hello Kitty, Snoopy and all the other playful animals? What makes you love them? Well, maybe because they're like the people around you. Think about it! You may just find a friend or classmate who is like them. Is he or she:
As sweet as Hello Kitty: She likes to eat cakes. She loves to make new friends She asks friends to her tea parties. She is warm and sunny and always help you.
As clever as Snoopy: He went to school when he was nine. He learned to use a typewriter in two years! He thinks a lot. He is so clever that you like to be with him.
As sarcastic(讽刺的)as Garlfield: He sits happily in the seat and says sharp words to you. Sometimes he is not nice. He doesn't really like you? He thinks you're a fool? No, in his heart, he loves you. He is a friend with hard words but a warm heart.
As naughty as Mashimaro: He doesn't look like a good boy. He has sleepy eyes and looks naughty. He always plays tricks on people. So you get angry with him and don't like him very much. His mind is active and full of ideas. He tries to be big and catch your eyes. But he's still a child.
有一LC振荡电路,如图所示,当电容调节为C1=200pF时,能产生频率为f1=500kHz的振荡电流,要获得频率为f2=1.0×103kHz的振荡电流,则可变电容应调为多大?(设电感L保持不变)
世界上工业化最早的国家是 ( )