发布时间:2025-02-02 11:05:26
以2倍左右最佳。实际功率越大,温升越大,寿命减小;实际功率越小,温升越低,不能有效驱除潮气,寿命减小。
要锻造一个直径为8cm高为4cm的圆柱形毛坯至少应载取直径我4cm的圆钢多少cm
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