operating altitude

• 有效高度,作战高度,实用升限,拦阻气球高度

operating altitude的用法和样例：

例句

1. The moving scale of the Mach number shows the value of Mach number within the limits of the operating altitudes and speeds.
   马赫数计指针显示了实用升限和实用速度内的马赫数。