A. 一级 B. 二级 C. 零级 D. 三级
A. 饱和蒸汽压下降 B. 沸点上升 C. 凝固点下降 D. 导电性增强
A. their peers are not good leaders B. they are good leaders C. their smart peers are thought to be less effective D. they are thought to be effective