The Boeing E-4 Advanced Airborne Command Post (AACP), the current "Nightwatch" aircraft, [2] is a series of strategic command and control military aircraft operated by the United States Air Force (USAF). The E-4 series are specially modified from the Boeing 747-200B for the National Emergency Airborne Command Post (NEACP) program. [3]

May 27, 2010 · e的意思就是10的几次方 e-4就是10的-4次方。=0.0001 同理，e4=10000

Apr 7, 2022 · 0.0004，e表示科学计数法，简单来说，e-的数字可以简单的在前边加0，-多少，就在前边加多少个0，并把小数点移到左数第1个0后边。例如4.0e-4，在前边加4个0，00004.0，移动小数点到左边第1个0后边，就是0.0004

波音e-4b，又稱為「末日飛機」，全稱為「國家空中指揮中心」（naoc），前身為「國家緊急空中指揮所」（neacp），由波音 747-200客機改裝而成，美軍目前擁有四架同類型客機。

e-4是10的-4次方的意思，也就是0.0001。 次方最基本的定义是：设a为某数，n为正整数，a的n次方表示为aⁿ，表示n个a连乘所得之结果，如2⁴=2×2×2×2=16。次方的定义还可以扩展到0次方、负数次方、小数次方、无理数次方甚至是虚数次方。

美国在役的最高级空中指挥机是E-4“国家应急空中指挥所”(National Emergency Airborne Command Post)，属于美国国家军事指挥中心的备份指挥设施。 当美国本土受到核攻击或大规模常规空袭时，最高领导层可在飞机上保持与本国战略核力量之间的联系和指挥功能。

Jan 28, 2025 · The most common rank held by members of the U.S. Army is that of a specialist E-4. In this article, we explore what the E-4 rank is in the U.S. Army and its average pay grade, with a comparison of other U.S. Army ranks and how you can transition through each.

E-4 is the 4th enlisted paygrade in the United States military, with monthly basic pay ranging from $2,633.70 for an entry-level E-4 to $3,197.40 per month for E-4 personnel with over 40 years of experience. The civilian equivalent of this military grade is roughly GS-4 under the federal government's General Schedule payscale.

e-4“国家空中作战中心”被誉为“飞行的白宫”，是美国全球空中移动指挥所系统的中心环节，可保障国家最高指挥当局(山总统、国防部长、 参谋长联席会议主席 及成员组成)指挥和控制美国部署在全球的军队，实施紧急战争法令和协调地方行政当局的行动(此 ...

The E-4B, also referred to as the National Airborne Operations Center (NAOC), routinely conducts global command and control missions for the Secretary of Defense when traveling overseas due to its robust communication capabilities.