FLASH : Green roller defect, caused by excessive stock forced out between taper die and head die.
毛刺:过多余量从锥模和顶模中挤出后引起的软滚子缺陷。
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The inside (including the taper) is usually made of cement or thermoplastic, since this material must be drilled out if the well is to be deepened beyond the casing point.
Then the count brought the taper to the window, that it might be seen in the champs-elysees that a man was getting out of the window while another held a light.