nóng yè kūn chóng xué | zhāng kāi "title=" zhāng kāi "style="vertical-align:middle"/> zuò wù zāi péi xué | zhāng kāi "title=" zhāng kāi "style="vertical-align:middle"/> zhí wù bìng lǐ xué | zhāng kāi "title=" zhāng kāi "style="vertical-align:middle"/> zuò wù yù zhǒng xué |