发布时间:2025-01-19 16:32:37
知道亩数就是知道了面积数,把它们单位统一后,长乘宽等于面积,用面积(亩数)除长度即得宽。
有一台水源热泵机组的功率为463kw如何计算它的电流使用多粗的电缆
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