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單項(xiàng)選擇題

Before starting the engine the air bottle should be （）.

A.pumped up
B.loaded
C.discharged
D.opened

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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