Helicopters exhibited in Tianjin
China.org.cn
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Helicopters are seen in the 5th China Helicopter Exposition held from Oct. 10 to 13 at the China Tianjin Port Free Trade Zone. [Photo/VCG]

A helicopter is seen in the 5th China Helicopter Exposition held from Oct. 10 to 13 at the China Tianjin Port Free Trade Zone. [Photo/VCG]

Helicopters are seen in the 5th China Helicopter Exposition held from Oct. 10 to 13 at the China Tianjin Port Free Trade Zone. [Photo/VCG]

Helicopters are seen in the 5th China Helicopter Exposition held from Oct. 10 to 13 at the China Tianjin Port Free Trade Zone. [Photo/VCG]

A helicopter is seen in the 5th China Helicopter Exposition held from Oct. 10 to 13 at the China Tianjin Port Free Trade Zone. [Photo/VCG]