steel button
... Steel Bushing 钢套 Steel Button 钢钮 Steel Csuitstomair-conhle 钢缆;钢丝绳; 钢丝索; 钢索 ...
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带有钢旋钮和环形手柄 with steel knob and ring handle
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螺栓荷载是用死荷重来模拟的，以钢球和压钮作为代用件，通过它们将此荷载施加于螺栓孔。
Dead weight loading simulating that of the bolts was applied at the bolt holes through the agency of steel balls and buttons.
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