2.正丁烷的构象 CH H CH3 CH3 CH, CH H H H H CH H CH, CH H H A.全重叠式B.顺交叉式C.部分重叠式D.反交叉式 E.顺交叉式 A C A| E B E D 0 60 120 180 240 300 360 Degrees of Rotation 02.正丁烷的构象 E Degrees of Rotation  A A E C C D B 0 60 120 180 240 300 360 H CH3 H CH3 H H H H H CH3 H HH H H CH3 H CH3 H CH3 H H H H H CH3 H CH3 H H H H H CH3 H H H H CH3 H A.全重叠式 B.顺交叉式 C.部分重叠式 D.反交叉式 E.顺交叉式