For many years Arsenal's away colours were white shirts and either black or white shorts. In the 196970 season, Arsenal introduced an away kit of yellow shirts with blue shorts. This kit was worn in the 1971 FA Cup Final as Arsenal beat Liverpool to secure the double for the first time in their history. Arsenal reached the FA Cup final again the following year wearing the red and white home strip and were beaten by Leeds United. Arsenal then competed in three consecutive FA Cup finals between 1978 and 1980 wearing their "lucky" yellow and blue strip, which remained the club's away strip until the release of a green and navy away kit in 198283. The following season, Arsenal returned to the yellow and blue scheme, albeit with a darker shade of blue than before.
When did Arsenal adolpt the away colors or yellow shirts and blue shorts?
196970 season

At present, the full name of the government of Nanjing is "People's Government of Nanjing City" and the city is under the one-party rule of the CPC, with the CPC Nanjing Committee Secretary as the de facto governor of the city and the mayor as the executive head of the government working under the secretary.
who is the executive leader of Nanjing, working under the secretary?
the mayor

A DBMS has evolved into a complex software system and its development typically requires thousands of human years of development effort.[a] Some general-purpose DBMSs such as Adabas, Oracle and DB2 have been undergoing upgrades since the 1970s. General-purpose DBMSs aim to meet the needs of as many applications as possible, which adds to the complexity. However, the fact that their development cost can be spread over a large number of users means that they are often the most cost-effective approach. However, a general-purpose DBMS is not always the optimal solution: in some cases a general-purpose DBMS may introduce unnecessary overhead. Therefore, there are many examples of systems that use special-purpose databases. A common example is an email system that performs many of the functions of a general-purpose DBMS such as the insertion and deletion of messages composed of various items of data or associating messages with a particular email address; but these functions are limited to what is required to handle email and don't provide the user with all of the functionality that would be available using a general-purpose DBMS.
How is the cost to create a DBMS distributed?
spread over a large number of users