314、Correct punctuation is important because it shows how the different parts of the text are related and prevents ambiguity.

1009、Airline operators are encouraged to evaluate their particular 737operating environment, accompanied with debris findings at time of cleaning to identify and implement the most effective and economic maintenance interval.

1008、Provide ventilation for lavatories and galleys.

1007、Fill the spaces between the patch and the adjacent structure with sealant.

1006、If contamination causes a blockage of more than 30 percent of the holes, then clean the holes on the rear of the display units.

1005、The system design makes sure that two AC power sources can not supply power to the same transfer bus at the same time.

1004、This will be limited to the forward and aft edges of the windshield due to the bottom edge not being visible and the top edge having the busbar in the way.

1003、Airworthiness Directive is procedure that must be used when performing maintenance on an aircraft.

1002、The system interface circuits adapt to the physical properties of the connected systems.

1001、In a high concentration,this material is poisonous.

1000、The flight crew can use the flight director commands to control the attitude of the airplane.Be1