单选题To avoid scavenge fires occurring the engine timing and equipment maintenance （）.Ashould be correctly carried outBshould correctly be taken placeCshould carried with careDmust to carry out with great care
单选题
To avoid scavenge fires occurring the engine timing and equipment maintenance （）.
A
should be correctly carried out
B
should correctly be taken place
C
should carried with care
D
must to carry out with great care
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