选项
A.
A.υRln$frac{(p_1+p_2)^2}{p_1p_2}$
B.
B.υRln$frac{(p_1+p_2)^2}{2p_1p_2}$
C.
C.υRln$frac{(p_1+p_2)^2}{3p_1p_2}$
D.
D.υRln$frac{(p_1+p_2)^2}{4p_1p_2}$
正确答案：
名词解析
https://qn-next.xuetangx.com/15693838004321.PNG/>、https://qn-next.xuetangx.com/15693837822040.PNG/>、解释 class="import-img" class="import-img"