如图所示,斜面倾角为α=37°,光滑的斜面上边放一个小球,用与斜面平行的轻绳把小球系住,使斜面与小球(sin37°=0.6,cos37°=0.8,g=10m/s2)
— Did you study any other languages English when you were at college?
— Yes, I studied three. But I have forgotten all a few words of each.
小肠上皮细胞所处的细胞外液是指( )