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【简答题】
Space heating through passive solar can be realized by _______. A. using overhangs that are used to shield the home from the high, summer sun, but are designed to allow the low, winter sunlight to enter the windows B. using building materials to absorb the sun's energy and store it, releasing it into the home at night after the sun has set C. using a flat-plate collector to absorb the sun's energy to heat the water. D. designing sunspaces and trombe walls
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【单选题】水是人类赖以生存的重要物质，而水污染却严重影响着人类的生存环境。下列不属于水污染的原因的是 （ ）
A.
工业生产中废渣、废液的任意排放
B.
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C.
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D.
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