豪猪用身上的刺毛来自卫。Porcupines use their spines to protect themselves.豪猪或刺猬身上硬而中空的保护刺.One of the sharp hollow spines of a porcupine or hedgehog.今天是笑翠鸟 ( 豪猪 ) 和臭鼬王国向你们问候.It is the Kookaburra ( Porcupine ) and Skunk Kingdoms that ...
在焊接处看到了夹渣, 气孔及未熔透区的油漆.Slag, blowholes, and paint on unfused regions were observed at the welded junctions.焊接处要平整.Welding shall be ground smooth.对于铝合金 、 铜 、 镁 、 锌合金铸造与焊接处之间的研磨性具有很好的效果.The products have a good effect on gr...