为了减少热电偶的测温误差,可以在热电偶外加抽气式遮热罩。
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一小凸表面被大表面包围,且小表面的面积远小于大表面的面积,为了强化两表面间的辐射换热,可以将大表面的表面涂上发射率很高的涂层。
A. 对
B. 错
Fill in the blanks with the words given below. Change the form where necessary.unique highlight eventually realizeaffordfellow localgrateful1 Do you_______ that you are an hour late?2 We can’t_________ to go on vacation this year.3 Your resume should__________ your skills and achievements.4 Although the original budget for the project was one billion Yuan, but________ the cost is likely to be 50% higher.5 Each person’s fingerprints are__________ .6 She has a very good reputation among her___________ .7 Many ________ shops will be forced to close if the new supermarket is built.8 I am very ________ to all those who help me.
重辐射面是指:
A. 多次参与辐射的表面
B. 是指表面温度未定,净辐射换热量为0的表面
C. 是指辐射不绝热的表面
D. 以上没有正确答案
空间辐射热阻与表面辐射热阻的概念里,以下说法错误的是:
A. 表面辐射热阻与表面发射率有关
B. 空间辐射热阻与两表面的相对位置,即与角系数有关
C. 对于黑体来说不存在表面辐射热阻
D. 对于灰体来说表面辐射热阻为0