584、 Because airplanes are intended to have long lives, their flight safety must be assured. 因为飞机是要有很长的寿命,所以必须保证飞行安全
答案解析
相关知识点:
飞机寿命长,飞行安全要保证
相关题目
634、the air pressure is above normal
633、The adjustment test description shall provide instructions accomplishment of a test or check to assure the integrity as anoperational component of a system, subsystem or unit assembly.
632、temporarily attach the cable to the adjacent structure o
631、Table of Contents pages must be dated but need not be numbered.
630、Supply hydraulic power to system with the pump.
629、Such wires and cables shall be capable of being connected to the ground network of the aircraft electrical system.
628、Such tests or checks will vary in complexity according to the conditions.
627、Stop the test after 2 seconds.
626、STE has a controlled general dictionary that gives the words that are most frequently used in technical writing
625、Start each section on a right-hand page
