3505| 7
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視在接觸面積與真實(shí)接觸面積 |
點(diǎn)評(píng)
沒加平墊和彈簧墊圈的情況,比較容易在受到震動(dòng)的條件下螺母發(fā)生松動(dòng)。
那如果。。。沒加平墊和彈簧墊圈呢
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本版積分規(guī)則
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