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Sikorsky Igor Ivanovich was a wellknown aircraft engineer and manufacturer.
Sikorsky was born in 1889 in Kiev, in the Ukraine, and got his education at the naval college in St. Petersburg, and later in Kiev and Paris. He was the first to make experiments in helicopter design. In 1913 he designed, built, and flew the first successful aeroplane. Later he built military aircrafts for Russia and France.
In 1919 Sikorsky moved to the United States and later helped to organize an aircraft company that produced a series of multiengine flying boats for commercial service. Sikorsky became an American citizen in 1928. In the late 1930s he returned to developing helicopters and produced the first successful helicopter in the west. Helicopters designed by Sikorsky were used mostly by the US Army Air Forces during World War II. He died in 1972 at the age of 83.
Tupolev Andrey Nikolayevich, famous aircraft de¬signer, was born in 1888. He graduated from the Moscow Higher Technical School, where he designed the first Russian wind tunnel. He helped to found the Central Aerohydrodynamics Institute in 1918 and later worked as the head of its design bureau. During his career he directed the design of more than 100 military and commercial aircraft, including the TU-2 and TU-4 bombers used in the World War II. In 1955 he designed the TU-104, the first passenger jet airliner. His TU-144 supersonic jet liner began its commercial passenger flights in 1977.

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а) четыре общих вопроса;
б) четыре специальных вопроса;
в) один альтернативный вопрос;
г) один разделительный вопрос

a) 1was Sikorsky Igor Ivanovich  a wellknown aircraft engineer and manufacturer. 2was igor the first to make experiments in helicopter design. 3 did Sikorsky become an American citizen in 1928. 4 did tupolev work as the head of  design bureau.b)where was sikorsky born.  where did igor produce the first successful helicopter. when was tupolev born. what did tupolev design. c)did sikorsky or tupolev design the first russian wind tunnel.d)During his career he directed the design of more than 100 military and commercial aircraft, including the TU-2 and TU-4 bombers used in the World War II, didn't he