This section briefly introduces the main components and functions of the aircraft, the basic methods of aircraft control, and the shape of the wing.

And many passengers also think that the plane is a confined space, and may not pay attention to the air circulation and filtration system of the cabin before experiencing the new crown epidemic.

The hole in the tail of the plane is the auxiliary power unit, or APU for short. Inside this hole is a small turbine engine (some of which are converted from turboprop engines), and this hole is used for intake and exhaust.