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2018-02-19View Original

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参与:奖3财富;回答正确:奖10财富;注:48小时内回答正确奖励10财富,此贴有效时间48小时。 选择题 :NPT螺纹的牙形角是( )。 A 60° B 55° C 50° D 65° 正确答案:A https://attach01.hcbbs.com/forum/201801/05/235057wnwxbzxb311ikvvz.jpg.thumb.jpg
Reply #22018-02-20
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