For the managed descent mode, the managed descent profile at high altitude is about ().
A.2.0 ° B.2.5 ° C.3.0 ° D.3.5 °正确答案B
For the managed descent mode, the managed descent profile at high altitude is about ().
A.2.0 ° B.2.5 ° C.3.0 ° D.3.5 °正确答案B
