家禽科学和技术手册，第1卷，初级加工。
Handbook of Poultry Science and Technology, Volume 1, Primary Processing.
邯郸地区膨润土资源开发研究从70年代初开始，至今仍停留在初级加工阶段。
The exploitation study of the Bentonnite in Handan area is started in 70s. But now the study is still the phase of the primary process.
邯郸地区膨润土资源开发研究从70年代初开始，至今仍停留在初级加工阶段。
The exploitation study of the Bentonnite in Handan area is started in 70'S.
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