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【单选题】
1 mol 理想气体 (1) 经恒温自由膨胀使体积增加一倍; (2) 经恒温可逆膨胀使体积增加一倍; (3) 经绝热自由膨胀使体积增加一倍; (4) 经绝热可逆膨胀使体积增大一倍。下列结论中正确的是( )。
A.
Δ S 1 = Δ S 2 = Δ S 3 = Δ S 4
B.
Δ S 1 = Δ S 2 ， Δ S 3 = Δ S 4 = 0
C.
Δ S 1 = Δ S 4 ， Δ S 2 = Δ S 3
D.
Δ S 1 = Δ S 2 = Δ S 3 ， Δ S 4 = 0
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