GK1C机车机油系统由哪几部分组成?
参考答案:
由机油泵、机油滤清器、机油冷却器、离心式机油滤清器、增压器机油精滤器及机油管路、安全阀、油压表、油压继电器等组成。
Mother was worried because little Tom was ill, especially his father HHhhwas away in Canada. [ ]
A. as
B. that
C. during
D. if
子宫内膜为分泌期时,卵巢的结构是?()
A.卵泡开始发育和成熟
B.卵泡退化阶段
C.黄体正在形成和发育
D.黄体正在退化
E.卵泡膜正在形成