In some designs the cylinder oil is timed so that the oil injects only on the （）.<br>A:piston crown<br>B:piston groove<br>C:piston skirt<br>D:piston ring belt

In some designs the cylinder oil is timed so that the oil injects only on the （）.
A:piston crown
B:piston groove
C:piston skirt
D:piston ring belt

出自：海船船员证

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