To predict helicopter vortex ring state boundary is necessary for flight safety.

直升机涡环状态边界的确定对直升机飞行安全具有重要意义。

youdao

To predict helicopter vortex ring state boundary is necessary for flight safety.

直升机涡环状态边界的确定对直升机飞行安全具有重要意义。

youdao