发布时间:2025-02-03 17:52:01
板式换热器:Q=K×F×Δt;
Q—热负荷;K—传热系数;F—换热面积;Δt—传热温差(一般用对数温差)
结婚想买一个卡地亚的戒指请问在法国买比较便宜还是香港比较便宜大概相差多少谢谢
2025-02-03 17:52:01 2025-02-03 17:52:01 2025-02-03 17:52:01 2025-02-03 17:52:01 2025-02-03 17:52:01 2025-02-03 17:52:01 2025-02-03 17:52:01求助聚乙烯丙纶防水卷材3004005006008001000规格的厚度各是多少
2025-02-03 17:52:01 2025-02-03 17:52:01 2025-02-03 17:52:01 2025-02-03 17:52:01 2025-02-03 17:52:01 2025-02-03 17:52:01 2025-02-03 17:52:01