Since 1928, the national government has successively signed tariff treaties with other countries, raising the import tariffs of matches, porcelain, sugar, cement, soap and other commodities to 1933.

Analysis of test questions: The national government raised the tariff level by revising the New Testament, which helped to increase tariff revenue on the one hand, and protected national industries on the other hand, and helped to resist commodity dumping in capitalist countries under the background of economic crisis in 1930s.