四个数字有多少种组合三位数

简介：Risong didn't speak that day, just looked at the cannons - they were a bit far away and he couldn't see the details of the cannons, but he knew that these small cannons were not heavy and could be pushed by three to four people. The wheel hubs were very high and very large. , almost half a person. If it were the Mongolian grassland, a horse could pull a small cannon around.