The airplane were delivered with re commended inspection programs to keep them airworthiness 飞机交付时釆用了推荐的检查程序，以保持其适航性
A.the delivery of the aircraft is required to ensure its airworthiness, therefore it is subject to customer inspection procedures B.The airplanes are airworthy because they were delivered in accordance with advised inspection procedures C.The airplanes are delivered with mandatory inspection procedures to ensure their airworthiness.正确答案B
