当需要考察一台航空发动机的高空性能时，可以利用三种型式的设备，即高空风洞、高空试验台和飞行试验台。

When it becomes necessary to examine the altitude performance of an aircraft engine, three types of facilities may be used-altitude wind tunnels, altitude test beds and flying test beds.

youdao

当需要考察一台航空发动机的高空性能时，可以利用三种型式的设备，即高空风洞、高空试验台和飞行试验台。

When it becomes necessary to examine the altitude performance of an aircraft engine, three types of facilities may be used-altitude wind tunnels, altitude test beds and flying test beds.

youdao