(20 10? China is one of the few countries that have mastered aerial refueling technology. As shown in the figure, the H -6 and two J-8Ds developed by China are independently developed.

When the tanker refuels the fighter, the position of the tanker relative to the pilot in the tanker, the pilot in the fighter and the fighter is unchanged, and the tanker is stationary based on the pilot in the tanker, the pilot in the fighter and the fighter; When refueling, the position of the tanker relative to the ground photographer is constantly changing, and the tanker moves with the ground photographer as the reference;

So choose D.