发动机噪音危害正确的是

28.The time intervals for the inspections vary with the types of aircraft( )

27.Each Handbook shall have an Airplane Weighing Form" that includes an airplane side view showing the location of weighing points[using jacking points or undercarriage]relative to the datum line( )"

26.Before you put new oil in the system, it is mandatory to replace the filter ( )

25.Adjust the gyro accurately( )

24.逆时针转动旋钮,以降低光的强度。 ( )

23.缓慢增加压力(每分钟不超过一圈)。( )

22.Lubricate the O-rings with hydraulic fluid( )

21.The bottom mark on the board is red( )

20.Carefully remove the trim cover from the adhesive tape( )

19.If the components fall, permanent damage can occur( )