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 wall that is very we(hm5*u3o baa a*bjfe0ll insulated — it has a very h6hb x+ps(p9 7nm8:dj muk l(wnigh thermal resistxjnhbpp( l sk:(7ud m968+mnwance, $R_1$ 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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