The diameter of the gravity disc is too big It causes oil to flow through the water outlet We changed the disc and no （） is found in the water outlet.<br>A:water<br>B:oil<br>C:scale<br>D:ridge

The diameter of the gravity disc is too big It causes oil to flow through the water outlet We changed the disc and no （） is found in the water outlet.
A:water
B:oil
C:scale
D:ridge

出自：海船船员证

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