润滑系的功用是什么？
参考答案：
润滑、清洗、冷却、密封、防锈、液压、缓冲；
点剪在（）时，是让发尾呈现不规则的线条和穿透感。
A.发尾
B.发根
C.发长中间
D.发干
T - bill yields can be thought of as :（）
A. real risk -free rates because they contain an inflation premium.
B. real rates because they contain an inflation premium.
C. nominal risk -free rates because they contain an inflation premium.
