绝缘层的厚度：熔结环氧粉末Thickness of insulation: fused epoxy powder：0.3mm，导热系数heat conductivity coefficient：0.35-0.4W/(m·K)
A: 正确
B: 错误
A: 正确
B: 错误
A
举一反三
- 中国大学MOOC: 绝缘层的厚度：熔结环氧粉末Thickness of insulation: fused epoxy powder：0.3mm，导热系数heat conductivity coefficient：0.35-0.4W/(m·K)
- 硬质聚氨酯泡沫塑料（俗称黄夹克）保温层厚度一般Rigid polyurethane foam (commonly known as yellow jacket) insulation thickness is general：40mm，导热系数heat conductivity coefficient 0.04 W/(m·K) A: 正确 B: 错误
- 中国大学MOOC: 硬质聚氨酯泡沫塑料（俗称黄夹克）保温层厚度一般Rigid polyurethane foam (commonly known as yellow jacket) insulation thickness is general：40mm，导热系数heat conductivity coefficient 0.04 W/(m·K)
- 总传热系数一般考虑保温层和埋地管的放热系数即可The total heat transfer coefficient generally considers the heat transfer coefficient of the insulation layer and buried pipe A: 正确 B: 错误
- The thermal conductivity of the insulation material outside the tube is 0.08W/m.K. The convection heat transfer coefficient outside the tube is 8W/m2.K. What is the critical insulation diameter of the tube? A: 20m B: 2m C: 0.2m D: 0.02m
内容
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总传热系数一般考虑保温层和埋地管的放热系数即可The total heat transfer coefficient generally considers the heat transfer coefficient of the insulation layer and buried pipe
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鸡蛋蛋壳适宜厚度为（ ）mm。 A: 0.2～0.25 B: 0.25～0.3 C: 0.33～0.35 D: 0.35～0.4
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The appropriate thickness of an egg shell is ( ) mm. A: 0.33~0.35 B: 0.2~0.25 C: 0.25~0.3 D: 0.35~0.4
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导热系数是表征材料导热能力大小的物理量,其单位是( ) A: W/(m·K) B: W/(m^2·K) C: W/(m^2) D: W/(K)
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下列物理量的单位，( ) 是错误的 A: 导热系数 [W／(m·K)] B: 比热容 [M／(k9·K)] C: 传热阻 [(m·K)／W] D: 传热系数 [W／(m2·K)