[国外标准] BS ISO 13909-4-2001 Hard coal and coke. Mechanical sampling. Coal. Preparation of test samples
[国外标准] BS ISO 13909-3-2001 Hard coal and coke. Mechanical sampling. Coal. Sampling from stationary lots.
[国外标准] BS ISO 13909-2-2001 Hard coal and coke. Mechanical sampling. Sampling from moving streams