国外新一代主战坦克普遍采用了液力机械式全自动传动装置。那么,发展一种新型液力机械式传动装置或一种新的液力传动系列大约需要多长时间呢?现举三个国家不同情况的典型例子来加以说明。 A new generation of main battle tanks abroad commonly used hydraulic mechanical automatic transmission. So how long does it take to develop a new hydrodynamic mechanical transmission or a new hydraulic transmission? A case in point is shown in three typical cases in different countries.