screw pair
... screw nut 螺帽 screw pair 螺旋偶 screw pile 螺旋椿 ...
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螺旋偶极 helix dipole
螺旋奇偶 helix odd-even
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如果用金属磨料如钢砂冲击铜质螺旋桨会在铜表面上残留，会与铜发生电偶腐蚀。
If such as metal abrasive is used in sand washing, itwill remain on the surface of the copper propeller, then galvanic corrosionwill occur with Cu.
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