Final protective fire is an immediately available barrier of direct and indirect fire designed to provide close protection to friendly positions and installations by impeding enemy movement through a defensive area. It involves the concentration of weapons fire directly in front of the unit to impede enemy movement.

Final protective fire, abbreviated as FPF, and also known as danger close, refers to a tactical plan for a military unit, typically infantry, to protect itself in defense against attack. The plan generally includes machine gun, mortar, and artillery fire prearranged to impede enemy movement across defensive lines or areas.

FPL is a line of fire established where an enemy assault is to be checked by the interlocking fires of all available weapons. The unit reinforces this line with protective obstacles and with final protective fires whenever possible.

2018年3月24日 · Typically the PL or PSG will set a Final protective fire plan (FPF) along with a Final protective line (FPL). The FPL for the infantry at a platoon level is a technique to block off the ORP if the enemy gets to close. The idea is the PL or PSG will call FPF and all 240s and 249s will shift fire to the right 5 degrees off the person to their right.

2018年12月22日 · Using the Final Protective Fire to stay Fit. As a young Marine grunt one of my favorite parts of field training was when we executed an FPF (Final Protective Fire), especially at night. To see all of our weapons firing at their maximum rate was always something to …

2015年2月25日 · 家族性肺纤维化（familial pulmonary fibrosis,FPF）属罕见病，是指家族中有 2 个或 2 个以上成员出现肺间质纤维化。 FPF 起病隐匿，其临床症状、体征与特发性肺间质纤维化（ IPF）相似，其组织病理学和（或）胸部高分辨率 CT（ HRCT）表现为普通型间质性肺炎（usual interstitial pneumonia,UIP），故又有学者称之为家族性特发性肺纤维化（ familial Idiopathic Pulmonary Fibrosis,FIPF）。 在临床上，IPF 属最常见的特发性间质性肺 …

有效部位沉积量是气雾剂质量检查中的一个指标，通常粒径为1.0-5.0μm的药物，被认为可优先到达肺部，也称为微小粒子部分（FPF）。 这些粒子在细支气管和肺泡内沉积的量称为有效部位沉积量。

Final Protective Fire (FPF) refers to a pre-arranged and integrated artillery or mortar fire method designed to stop or halt enemy advancements by creating a barrier of fire. The FPF is the most concentrated, deadly and destructive form of defensive fire available to a unit.

A FPF may be located within 60 meters of the FEBA. Thus the 60-mm mortar can cover small gaps or dead space in the machine gun FPF close to the FEBA. Firing positions for mortars should be located between 150 and 300 meters to the rear of the FEBA.

2020年12月8日 · FPD：fine particle dose，微细粒子剂量；指随驱动从装置发射的、以小于规定极限的空气动力学粒径存在的活性剂的总质量。 如果没有明确说明设定为其他的极限，例如3μm或1μm等，通常将该极限设定为5μm。 FPD是使用冲击器或碰撞器，例如两级碰撞器 (TSI)、多级碰撞器 (MSI)、Andersen级联碰撞计或下一代冲击器 (NGI)来测量的。 FPF：fine particle fraction ，微细离子分数；定义为FPD除以发射剂量并且以百分数来表示。 MMAD ：mass median …