Shaker, circulation and spray are the three general methods used in（）<br>A:pre-injection fuel oil treatment<br>B:lube oil filtration<br>C:lube oil purification<br>D:piston cooling

Shaker, circulation and spray are the three general methods used in（）
A:pre-injection fuel oil treatment
B:lube oil filtration
C:lube oil purification
D:piston cooling

出自：海船船员证

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