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单选题
1816. Airline operators are encouraged to evaluate their particular 737NG operating environment, accompanied with debris findings at time of leaning to identify and implement the most effective and economic maintenance interval
A
Airline operators should determine and carry out the most effective and economic maintenance interval after evaluating their particular737NG operating environment and the debris found when cleaning.
B
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 737NG.
C
Before identifying the most effective and economic maintenance interval, airline operators can evaluate the 737NG operating environment by cleaning the debris.
答案解析
正确答案：A
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