Before replacing a piston you should check the rings to see that all clearances and gaps are （） the permissible tolerances.<br>A:above<br>B:at<br>C:over<br>D:within

Before replacing a piston you should check the rings to see that all clearances and gaps are （） the permissible tolerances.
A:above
B:at
C:over
D:within

出自：海船船员证

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