【法】 关键时间, 重要时间

TAPPING metal or other material [= screw-threading]

abrasive material, loose

spoil (muck, pile, broken material) removing

adhesive-bonded dowel, non-metallic dowel made of loose material

grinding with loose abrasive material

input material

fluidised-bed technique packing material, stationary

ferrite magnet, oxide magnet, material non-metallic