单项选择题

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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单项选择题

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

单项选择题

Before replacing a piston you should check that all rings are （）.

A.free
B.fastened
C.broken
D.stuck

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