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单选题
1009、 Airline operators are encouraged to evaluate their particular 737operating environment, accompanied with debrisfindings at time of cleaning to identify and implement the most effective and economic maintenance interval.
A
Before identifying the most effective and economic maintenance interval, airline operators can evaluate the 737 operatingenvironment by cleaning the debris.
B
Airline operators should determine and carry out the most effective and economic maintenance interval after evaluatingtheir 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 thedebris accumulated in particular areas of 737.
答案解析
正确答案：B
解析：
解析:注释: identify and implement=determine and carryout 确定和实施。
相关知识点：
发动机控制仪，术语说明示例
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