(1) According to the map analysis, the commodity grain base in Chengdu-Chongqing Economic Zone is Chengdu Plain, with flat and fertile terrain, and there are many rivers such as Yangtze River and Jialing River nearby, with sufficient irrigation water sources. In addition, the subtropical monsoon climate is abundant in heat, with the same rain and heat, which provides favorable conditions for agricultural development.

(2) According to the diagram analysis, the east end of the railway is the East Asian cultural circle, people like to eat rice and use chopsticks, China people like to wear cheongsam, and Japanese people like to wear kimono; The western end of the railway is located in the western European cultural circle. People like to eat dairy products, use knives and forks and believe in Christianity.

(3) According to the information provided by the materials, the similarities in industrial development between the two places are analyzed: Ruhr is rich in coal resources, Chengdu-Chongqing Economic Zone is rich in hydropower and natural gas resources, and how rich the two places are; There are natural rivers such as Rhine River and Ruhr River in Ruhr District, and rivers such as Minjiang River and Jialing River in Chengdu-Chongqing Economic Zone, which are abundant in water resources. Ruhr area has not only natural navigation channels such as Rhine River, but also artificial canals, with developed railway and highway traffic. Chongqing and other places in Chengdu-Chongqing Economic Zone are important transportation hubs in southwest China, with developed inland river shipping, railway and highway transportation and convenient transportation. Ruhr District is located in a developed industrial zone in Western Europe, with a broad consumer market, a dense population and towns in Chengdu-Chongqing Economic Zone and a broad domestic market.

So the answer is:

(1) Chengdu Plain? Basin topography, flat terrain, fertile soil, easy to cultivate; There are many rivers such as Yangtze River and Jialing River nearby, which provide sufficient water for agricultural irrigation. Subtropical monsoon climate, abundant heat, abundant precipitation and both rain and heat provide suitable climatic conditions for agricultural development.

(2) The eastern end is located in the East Asian cultural circle; Rice production culture, using chopsticks; China cheongsam, Japanese kimono.

The western end is located in the western European cultural circle; Dairy production culture, using knives and forks; Believe in Christianity, etc.

(3) Rich resources: Ruhr is rich in coal resources, and Chengdu-Chongqing Economic Zone is rich in hydropower and natural gas resources.

Abundant water resources: there are natural rivers such as Rhine River and Ruhr River in Ruhr, and Minjiang River and Jialing River in Chengdu-Chongqing Economic Zone.

Convenient land and water transportation: Ruhr District has not only natural waterways such as the Rhine River, but also artificial canals, with developed railway and highway transportation. Chongqing and other places in Chengdu-Chongqing Economic Zone are important transportation hubs in southwest China, with developed inland river shipping, railway and highway transportation. The Chongqing-Chongqing-New Europe Railway shortens the distance between the southwest of China and European countries.

Broad market: Ruhr District is located in a developed industrial zone in Western Europe, with a broad consumer market. Chengdu-Chongqing Economic Zone has a dense population, dense towns and a vast domestic market.