7307| 20
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平鍵裝配時(shí),不得配制成階梯型——風(fēng)險(xiǎn)在哪里,? |
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點(diǎn)評(píng)
比較多才會(huì)在標(biāo)準(zhǔn)中提出不允許。沒(méi)見(jiàn)到標(biāo)準(zhǔn)的宣講材料,。能有針對(duì)修配行業(yè),,根據(jù)負(fù)載情況建議的階梯鍵尺寸可能更好�,?姑涝瘧�(zhàn)爭(zhēng)開(kāi)始期間搭建的鐵路橋壽命能有三天就行,,一是應(yīng)急修建要快,二是三天可能就被轟炸了
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點(diǎn)評(píng)
強(qiáng)度當(dāng)然要考慮
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