668.Drains let fuel in the vent system return to the tanks ( )

269.涡轮发动机的主要工作原理是压缩大量空气,使之与燃料混合并燃烧。 ( )

268.The Nitrogen Generation System reduces the oxygen content of the air mixture in the center tank to a level which will not support combustion ( )

267.Distribution is the system used to induct and distribute air ( )

266.Direction as to who and how to contact technical personnel at the manufacturers Plant, for assistance in repairing or replacing items damaged and not covered by a standard repair ( )

265.按需向液压油箱加液压油 ( )

264.In addition ,this section may contain a comprehensive list of equipment available for installation by the manufacturer ( )

263.If the values are different, do this test( )

262.This Section shall describe the airplane in a manner considered by the manufacturer to be most informative to the kind of pilot considered most likely to operate the airplane ( )

261.The emergency exit doors are used to facilitate evacuation that are not normally used for exit ( )

260.许多读者的英语知识有限,复杂的句子结构和许多英语单词所具有的大量的意义和同义词会引起混淆。 ( )