半圆头铆钉
- 网络Round head rivets
半圆头铆钉-
GB/T863.1-1986半圆头铆钉（粗制）精密半自动万能圆磨床
Round head rivets & Black precision semi-automatic universal cylindrical grinder
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（用来指月亮）大于半圆。GB/T867-1986半圆头铆钉
( used of the moon ) more than half full . Round head rivets
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总是主动挑起最艰巨最危险的任务，兢兢业业，排除万难去圆满完成。双半径半圆头铆钉窝子
He always asked to take on the hardest and most dangerous tasks and carried them out by surmounting all difficulties . double radius button head snap