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参加報酬：2富。正解者への報酬：9財富 R22の二段圧縮式冷凍サイクルでは、冷凍係数を向上させるために通常( )が用いられる。 A.t-s図 B.p-h図 C.h-d図 D.循環模式図
A.t-s図 R22二段圧縮冷凍サイクルでは、冷凍係数を向上させるために（A.t-s図）がよく用いられる。
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