单项选择题
A.Rln2 B.(1/2)Rln2 C.(1/3)Rln2 D.Rln4
A.1 B.3 C.6 D.0
A.1.15 B.1.4 C.1.7 D.1.33
A.10K B.15K C.30K D.300K
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