已知△ABC与△A1B1C1的相似比为2:3,△A1B1C1与△A2B2C2的相似比为3:5,那么△ABC与△A2B2C2的相似比为____
依法治国的核心和关键是( )
— ______ is the Changjiang River in China, do you know?— Yes, it's about 6,380 kilometers long.