A separate piston cooling system is used （） any contamination from piston cooling glands to the piston cooling system only.<br>A:to help<br>B:to limit<br>C:to protect<br>D:to remove

A separate piston cooling system is used （） any contamination from piston cooling glands to the piston cooling system only.
A:to help
B:to limit
C:to protect
D:to remove

出自：海船船员证

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