推煤机发动机主轴承润滑油,按油脂进入润滑油的情况,应属于无压润滑。
参考答案:错
— Her father is very rich.
— ____ She wouldn't accept his help even if it were offered.[ ]
A. What for?
B. So what?
C. No doubt.
D. No wonder.
病理缩复环最多见于下列哪种情况()
A.胎儿畸形
B.子宫收缩乏力
C.头盆不称
D.软产道异常
E.臀位