人格具有以下特点（）
A.差异性
B.整合性
C.适应性
D.层次性
E.稳定性
参考答案：A, B, C, D, E
Three hours _____ enough for us to finish the task. [ ]
a. are
b. has
c. is
d. were
汽轮机油主要用于何处，起何作用？
