5109| 16
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各種防松方式比較 |
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點(diǎn)評(píng)
請(qǐng)教:"需要保證持續(xù)壓緊力場(chǎng)合",何種放松方法比較好?
對(duì)于雙螺母這種東西的使用場(chǎng)合,就不是一個(gè)專(zhuān)業(yè)問(wèn)題,而是一個(gè)生活常識(shí)問(wèn)題。
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