铁砧：一小块经过研磨和抛光的铁块，附于千分尺上面作为平直固定的测量参考点。
ANVIL: a small piece of ground and lapped steel attached to the frame of a micrometer; serves as a flat, fixed point from which measurements can be taken.
将供给态粉和研磨态粉由激光衍射法、FSSS法和BET法测量出颗粒粒度。
FSSS method, laser diffraction method and BET method were used to perform the particle size measurement.
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