发布时间:2025-02-03 09:08:54
可以用GCR15锻材,表面高频淬火(需要防锈的场合可以镀硬铬),淬火深度控制在1.5~6MM之内(视辊子的直径而定,直径越大越深,否则反之),这样表面硬度一般在HRC60~64之间,内部韧性也比较好.
很多乳胶枕的卖家都自称是天然乳胶,如何分辨天然乳胶与合成乳胶呢
2025-02-03 09:08:54 2025-02-03 09:08:54 2025-02-03 09:08:54 2025-02-03 09:08:54 2025-02-03 09:08:54 2025-02-03 09:08:54 2025-02-03 09:08:54 2025-02-03 09:08:54 2025-02-03 09:08:54 2025-02-03 09:08:54我是河北邯郸的刚买的不到3000元的太阳能现在晚上到第二天早晨温度显示下降10度正常吗
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