2845| 12
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階梯軸在直徑相差不大時(shí),,應(yīng)采用的毛坯是什么,? |
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點(diǎn)評(píng)
應(yīng)力大和重要場(chǎng)合就需要鍛造,,還有工藝需要的場(chǎng)合
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