Utilizing an airplane as intended oy the manufacture, combined with, sound, inspection and maintenance practice, forms the basis for assuring the airplane remains airworthy and safe to operate 利用飞机的目的是制造，结合，声音。检查和维修实践是确保飞机适航和安全运行的基础
A.The basis for assuring an airplane remains airworthy and safe to operate is, to combine the manufacturer's requirement Switch sound inspection and maintenance practices. B.To ensure airworthiness and safe operation of an airplane, itis essential to follow the manufacturer's instructions in the utilization of airplane and perform sound inspection and maintenance practices as well. C.Airworthiness and safe operation are fundamental to aircraft utilization as required by the manufacturer, so sound inspection and maintenance/practices are carried out.正确答案A
