Home / Standards / GB/T 2007.7-1987 GB/T 2007.7-1987 Active General rules for the sampling and sample preparation of minerals in bulk--The method for determination of size by manual sieving 散装矿产品取样、制样通则 粒度测定方法 手工筛分法 Standard Type GBT ICS 73-010 CCS D04 Status 现行 Issue Date 1987-12-19 Implementation 1988-10-01 Responsible Dept 市场监管总局 Drafting Unit N/A