发布时间:2025-02-08 23:59:41
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。
用56米长的木栏围成长或宽是28米的长方形其中一边利用围墙怎样才能使围成的面积最大
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