In the Oil Record Book, a comprehensive list of operational items are grouped into operational sectionsEach section is codified by a/an （）.<br>A:number<br>B:abbreviation<br>C:letter<br>D:All of the above

In the Oil Record Book, a comprehensive list of operational items are grouped into operational sectionsEach section is codified by a/an （）.
A:number
B:abbreviation
C:letter
D:All of the above

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