1215、If the components fall, permanent damage can occur.

274、If contamination causes a blockage of more than 50 percent of the holes, then clean the holes on therear of the display units.

273、The system design makes sure that two AC power sources can not supply power to the same transferbus at the same time.

272、This will be limited to the forward and aft edges of the windshield due to the bottom edge not beingvisible and the top edge having the bus bar in the way. 这将是有限的向前和尾部边缘的风挡玻璃由于底部边缘不可见和顶部边缘有母线在路上。

271、Airworthiness Directive is procedure that must be used when performing maintenance on an aircraft

270、The system interface circuits adapt to the physical properties of the connected systems.

269、In a high concentration, this material is poisonous.

268、The flight crew can use the flight director commands to control the attitude of the airplane.

267、Do test B as an alternative to test A. 做测试 B 作为测试 A 的替代方案。

266、Care must be taken not to damage the firewall cover.

265、The topic sentence is the first and most important sentence in a paragraph.