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__________ (HSPF) is used to measure heating efficiency. The HSPF is a comparison of the __________ compared to the __________.
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Q21: The h1 element represents the highest-level heading
Q22: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TBX8929/.jpg" alt=" In the figure
Q27: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TBX8929/.jpg" alt=" In the figure
Q30: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TBX8929/.jpg" alt=" In the figure