本题目来源于试卷: gc textbook chater 14 heat，类别为 IB物理学
[问答题]
Imagine you have a wp0rj z5 lhvi..apo0arh7 cz lz7;5 m -jb36-2sxguul+ mcc8s ehll that is very well insulated — it has a very high thermal res0 gr px3c67uo8-slsecbz +chhm57-;uzaml j2 istance, $R_1$ Now you place a window in the wall that has a relatively low R-value, $R_2$ What has happened to the overall R-value of the wall plus window, compared to $R_1$ and $R_2$ [Hint: The temperature difference across the wall is still the same everywhere.]
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