The pining position is sleeping on one side with arms extending out at right angles to the body. This type pf sleepers might be skeptical and cynical.
侧卧，两臂向外伸展，与身体形成直角的睡姿被称为“思念式”，有这样睡姿的人可能比较多疑且愤世嫉俗。
Analyzes the explosion accident of the PF bunker type milling system with exhaust gas as the conveyance medium of NO. 10 boiler in Minhang Power Plant.
对闵行发电厂10号炉乏气送粉制粉系统爆炸事件进行了分析。
Based on the practices and improvement of A-type flotator in aeration rate control by inns of pulp cycling, a new PF-type flotator and its sortal products are designed and put into production.
经过多年的浮选实践，对A型浮选机进行了改造，发现用矿浆回流的方法可以有效地控制浮选机的充气量。在此基础上设计出PF型浮选机，并已向系列化产品迈进。
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