测水平大气压一边低一边高

简介：Fan Wencheng shook his head: It will be difficult in a short time. After the Shanxi merchants were raided, the merchants were frightened. No one dared to do business with the Qing Dynasty anymore. Some big merchants who originally focused on border trade have switched to domestic sales. Some small businessmen in Jin had no capital and found it difficult to do big business.