九个数复式二中二连多少组

简介：There are 800 craftsmen in the entire cannon foundry, and each year they can cast ten 2,000-pound Hongyi cannons and 300 small cannons of various colors. However, the treasury was empty and financial difficulties had greatly affected the production of the cannon foundry. Production was intermittent, and it was common for ten days and a half to go without firing.