工质热力学能中的哪个是比体积的函数（）
A.平动动能
B.转动动能
C.振动动能
D.内势能
参考答案：D
— When did you lose your passport, sir?
— It was yesterday evening ______ I was walking down the street. [ ]
A. when
B. that
C. which
D. on which
－2,1,7,16，( ),43
A．25
B．28
C．31
D．35
