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GB/T 23561.4-2009  China national standard english version:

　
GB
中华人民共和国国家标准
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA

GB/T 23561.4-2009

Methods for determining the physical and mechanical properties of coal and rock - Part 4: Methods for calculating the porosity of coal and rock
煤和岩石物理力学性质测定方法 第4部分：煤和岩石孔隙率计算方法
Issued Date:2009-04-08 　 Implemented Date:2009-12-01
Issued by: 　 The Standardization Administration of the People's Republic of China
　

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GB Standard Code GB/T 23561.4-2009
Standard Category China National Standards
GB Standard English Title Methods for determining the physical and mechanical properties of coal and rock - Part 4: Methods for calculating the porosity of coal and rock
GB Standard Chinese Title 煤和岩石物理力学性质测定方法 第4部分：煤和岩石孔隙率计算方法
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