{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What are the types of network topologies in a blockchain?","a":"Bus topology: All nodes are connected through a main line to achieve data transmission and communication. This topology is  simple and easy to implement, but has poor scalability."}]}],"pr":"a0da908c9a3e6d7a198bc20c1a95052bb5cf3c58dc64200d08c6b9f2a47edc8b"}