直升机是一种以发动机驱动的旋翼作为升力和推力来源,能垂直起降以及前后左右飞行的航空器。近年来,因直升机在抗震救灾中所发挥的重要作用,从而引起了国人的关注。实际上,直升机早已广泛应用于国防、农业、消防、探测、旅游等领域中。现在,让我们通过邮品走近中国直升机。一、直-5直升机直-5直升机是哈尔滨飞机工业公司按照苏联提供的全套米-4直升机图纸资料仿制而成的,1958年12月14日首次 A helicopter is an aircraft that uses an engine-powered rotor as a source of lift and thrust, capable of vertical take-off and landing and flying around. In recent years, due to helicopters in earthquake relief has played an important role, which has aroused the concern of the people. In fact, helicopters have long been widely used in national defense, agriculture, fire protection, exploration and tourism. Now, let’s approach the Chinese helicopter through the mail. First, Straight -5 helicopter Straight -5 helicopter is Harbin Aircraft Industry Corporation in accordance with the Soviet Union to provide a full set of Mi-4 helicopter drawings imitation made of, December 14, 1958 for the first time