Home / Standards / GB/T 35206-2025 GB/T 35206-2025 Active Thin section examination of shale and mudstone 页岩和泥岩岩石薄片鉴定 Standard Type GBT ICS 75.020 CCS E 11 Status 现行 Issue Date 2025-08-01 Implementation 2026-02-01 Responsible Dept 国家标准委 Drafting Unit N/A