請問什麼是..........?

Question

請問什麼是D-Day?

Answer 1

在軍事術語中，D日(D-Day)經常用作表示一次作戰或行動發起的那天。迄今為止，最著名的D日是1944年6月6日 - 諾曼第戰役打響之日 - 即同盟國反攻在第二次世界大戰中被納粹德國佔領的歐洲大陸的開始。本文將介紹術語D日的一般用途。

術語D日和H時用作表示一次作戰或行動發起的日期和時刻。之所以使用D和H，是由於英文「日」和「時」的首字母。它們在行動日期和時刻未決定或保密的時候作為行動日期和時刻的代號。通常所有參與一次特定行動的所有單位擁有唯一的D日和H時。不言而喻，H時應在D日當中。

當和數字以及正號或負號一起使用時，這些術語表示指定行動的提前或推遲時間長度。如H-3時表示H時的3小時前，D+3日表示D日的3天後。H+75分則表示H時加上1小時15分鐘。

大規模行動的計劃書通常在行動時刻之前很久就會詳細得制訂完畢。因此，命令通常會通過標記有D日或H時加上或減去一個特定日，時或分的數字來下達。在後來的適當時間，後續的命令將標記真實的日期和時間。

最早使用這些術語的是第一次世界大戰中的美軍。在日期為1918年9月7日的美國遠征軍第一軍的第9號戰地命令中寫到「第一軍將在D日H時發起以迫使St. Mihiel Salient撤退為目的的攻擊。」

諾曼第登陸的D日被定為1944年6月6日，這天也被廣泛得由D日這個縮寫來代替(法語中被稱作Jour-J.)。

參看
H時
諾曼第戰役

參考文獻
The General Service Schools, Fort Leavenworth, Kansas, Combat Orders (Fort Leavenworth, Kansas: The General Service Schools Press, 1922).
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In English military parlance, D-Day is a term often used to denote the day on which a combat attack or operation is to be initiated. While the initial D in D-day does not stand for anything, it often represents a variable, designating the day upon which some significant event will or has occurred; see Military designation of days and hours for similar terms.

By far, the best known D-Day is June 6, 1944 — the day on which the Battle of Normandy began — commencing the Western Allied effort to liberate mainland Europe from Nazi occupation during World War II. However, many other invasions and operations had a designated D-Day, both before and after Operation Overlord. D-Day was originally planned for June 5, 1944 but bad weather and heavy seas delayed that.

The terms D-day and H-hour are used for the day and hour on which a combat attack or operation is to be initiated. They designate the day and hour of the operation when the day and hour have not yet been determined, or where secrecy is essential. There is but one D-day and one H-hour for all units participating in a given operation.

When used in combination with figures, and plus or minus signs, these terms indicate the point of time preceding or following a specific action. Thus, H−3 means 3 hours before H-hour, and D+3 means 3 days after D-day. H+75 minutes means H-hour plus 1 hour and 15 minutes.

Planning papers for large-scale operations are made up in detail long before specific dates are set. Thus, orders are issued for the various steps to be carried out on the D-day or H-hour minus or plus a certain number of days, hours, or minutes. At the appropriate time, a subsequent order is issued that states the actual day and times.

The earliest use of these terms by the U.S. Army that the Center of Military History has been able to find was during World War I. In Field Order Number 9, First Army, American Expeditionary Forces, dated 7 September 1918: "The First Army will attack at H hour on D day with the object of forcing the evacuation of the St. Mihiel Salient."

D-day for the invasion of Normandy by the Allies was originally set for 5 June 1944, but bad weather caused Gen. Dwight D Eisenhower to delay until 6 June and that date has been popularly referred to ever since by the short title "D-day". (In French, it is called JourJ or Le Choc.) Because of this, planners of later military operations sometimes avoided the term. For example, Douglas MacArthur's invasion of Leyte began on "A-day", and the invasion of Okinawa began on "L Day". The Allies proposed invasions of Japan that would have begun on "XDay" (Kyūshū, scheduled for November 1945) and "YDay" (Honshū, scheduled for March 1946).

Answer 2

與其算計何時升到甚麼級別，不如數數自己在知識+的真正貢獻吧。

Answer 3

與其算計何時升到甚麼級別，不如數數自己在知識+的真正貢獻吧。

Answer 4

與其算計何時升到甚麼級別，不如數數自己在知識+的真正貢獻吧。

Answer 5

與其算計何時升到甚麼級別，不如數數自己在知識+的真正貢獻吧。

Answer 6

與其算計何時升到甚麼級別，不如數數自己在知識+的真正貢獻吧。

Answer 7

與其算計何時升到甚麼級別，不如數數自己在知識+的真正貢獻吧。

Answer 8

與其算計何時升到甚麼級別，不如數數自己在知識+的真正貢獻吧。

Answer 9

與其算計何時升到甚麼級別，不如數數自己在知識+的真正貢獻吧。

Answer 10

在軍事術語中，D-day經常用作表示一次作戰或行動發起的那天。迄今為止，最著名的D-day是1944年6月6日 - 諾曼地戰役打響之日 - 即解放在第二次世界大戰中被納粹德國佔領的歐洲大陸的開始。本文將介紹術語D-day的一般用途。

術語D-day和H時用作表示一次作戰或行動發起的日期和時刻。之所以使用D和H，是由於英文「日」和「時」的首字母。它們在行動日期和時刻未決定或保密的時候作為行動日期和時刻的代號。通常所有參與一次特定行動的所有單位擁有唯一的D-day和H時。不言而喻，H時應在D-day當中。

當和數字以及正號或負號一起使用時，這些術語表示指定行動的提前或推遲時間長度。如H-3時表示H時的3小時前，D+3日表示D日的3天後。H+75分則表示H時加上1小時15分鐘。

大規模行動的計劃書通常在行動時刻之前很久就會詳細得制訂完畢。因此，命令通常會通過標記有D-day或H時加上或減去一個特定日，時或分的數字來下達。在後來的適當時間，後續的命令將標記真實的日期和時間。

最早使用這些術語的是第一次世界大戰中的美軍。在日期為1918年9月7日的美國遠征軍第一軍的第9號戰地命令中寫到「第一軍將在D-dayH時發起以迫使St. Mihiel Salient撤退為目的的攻擊。」

諾曼地登陸的D-day被定為1944年6月6日，這天也被廣泛得由D-day這個縮寫來代替(法語中被稱作Jour-J.)。