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分多层切削加工螺纹时，应尽可能平均分配每层切削的背吃刀量。（ ）

A．对
B．错
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Forty years ago, a historic document was signed in Rome that was to change the economic outlook and the future of many countries in EuropE.That document was the Treaty of Rome, and this year, on March 25, 1997, the European Union celebrated the 40th anniversary of its signing. A revised draft treaty on European Union (The Maastricht Treaty) was presented in Rome on that datE.(1) The revised Treaty is a continuation of the process towards integration of the countries of Europe that began in 195'7.
(2) The Treaty of Rome was a historic milestone on the road to European integration, but the foundations had been laid almost ten years earlier. In the aftermath of world War Ⅱ on May 9, 1950, Robert Schuman, Foreign Minister of France, proposed the pooling of coal and steel production as part of a Franco-German union.
Six founding countries signed the Treaty of Paris in 1951 to form. the European Coal and Steel Community (ECSC). A single market in coal and steel was to be set up among signatory countries. (3) Within a few months, all customs and discriminatory practices were swept away. For the coal and steel industries at least, frontiers ceased to exist. The Schuman Plan, as it was known, was the first step towards a united EuropE.The signatory countries—Italy, France, Germany, Belgium, Luxembourg and the Netherlands—formed the building blocks of what know today as the European Union.
Six years later European leaders such as Konrad Adenauer, Paul-Henry Spaak and Jean Monnet thought it time to apply the same approach to the entire economies of the six members of the ECSC.(4) The Treaty of Rome established the European Economic Community (EEC) and the European Atomic Energy Community (Euratom) in 1957 and, in effect, marked the ‘relaunching of Europe’ after the devastating of World War II.
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