What was one important inventions of the tang and song dynasty?

Circuit of soft switching technique using zvzct in buck converter? What are the difference between elactric field and electric displacement field? Why do you use bricks for building? What mechanical devices produce reciprocating motion from rotary motion? How do you take apart pue geot 306 wing mirror? What is links in HTML? The A-10 fuselage components that redistribute loads around cutouts and provide redundant load paths are? Why is it important for the roadways to have rough surface? Who discovered the Nd-YAG laser? Where does unwanted heat come from your house? Which advancement in technology helped reduce the amount of solid waste produced? Why is the primary of a transformer 11kv? How do you get cleverbot to say he is a robot? Which one of the following non-xml based stylesheet specifications do you use to format the visual appearance of both HTML and xml documents? How do you raise a number to a power? How do you calculate developed length of sheet metal forming? What is ritc code for Cistern and tank? Single phase 220 volts 2.6 kW how many amps? Can generator power a washer machine? What is the 3 step process to reverse engineering?