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【单选题】
自然循环热水采暖系统由于自然压头小,因而其作用半径(立干管走向的水平距离)不宜超过( )m。
A.
30.0
B.
50.0
C.
60.0
D.
80.0
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【单选题】The home service industry in Beijing is expected to become more attractive both as a job and as an industry. Sources at the Beijing People' s Political Consultative Conference said resistance to home ...
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