To prevent overheat damage to the wing leading edge, the engine bleed air is given maximum cooling during ground operations.为了防止过热损坏机翼前缘，在地面操作时给予发动机引气最大冷却。
A.Prior to ground operations, maximum cooling of the engine bleed air is provided to avoid the overheat damage to the wing leading edge. B.To keep the wing leading edge from overheat damage, the engine bleed air has a maximum cooling effect during ground operations. C.while the aircraft is operating on the ground, the engine bleed air provides a best cooling to the wing leading edge to renovate the damage due to overheat.正确答案B
