Primary minerals are coal, copper and zinc, and agricultural products include rice, peanuts, sugar cane, fruits, vegetables and tobacco.
矿产主要有煤、铜和锌，农产品包括米、花生、甘蔗、水果、蔬菜和烟草。
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Results showed that the coating problem of hot-dip zinc plating workpiece was improved evidently by using the degassing agents MPP230 and MPP620 containing a primary component of polyethylene wax.
Reaction of lower primary alcohol and ethylene oxide was studied by zinc perchlorate as catalyst, and the products are narrow distributed. The suitable process conditions have been established.