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

【单选题】
A Before identifying the most effective and economic maintenance interval,airline operators can evaluate the 737 operating environment by cleaning the debris.
B Airline operators should determine and carryout the most effective and economic maintenance interval after evaluating their particular 737operating environment and the debris found when cleaning.
C In order to find the most effective and economic maintenance interval, airline operators have to evaluate and clean the debris accumulated in particular areas of 737.

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