17799| 32
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GB所說(shuō)的O型圈的直徑是內(nèi)圈還是外圈? |
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點(diǎn)評(píng)
標(biāo)好了截面,就知道是內(nèi)徑還是外徑了,比如3.55的圈,丫敢說(shuō)是外徑,直接板磚招呼。
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