单选题Before replacing a piston you should check the rings to see that all clearances and gaps are within the permissible （）.AdeflectionBdiscrepancyCerrorDtolerance
单选题
Before replacing a piston you should check the rings to see that all clearances and gaps are within the permissible （）.
A
deflection
B
discrepancy
C
error
D
tolerance
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