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在制冷剂选择时,要求沸点 ,临界温度 ,凝固温度 ,保证制冷剂在较广的温度范围安全工作。
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【简答题】The biggest festival 1______ the Chinese calendar is the New Year. The date 2_____ the New Year depends 3______ the moon so it changes every year, but it is always 4_____ January or February. 5_____ C...
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