[主观题] 【英译中】Although the other three strokes are necessary,they are idle strokes.

1、[单选题]The function of the piston rings is to ________.

• A、help cool the piston by transferring heat from the piston to the cylinder wall
• B、provide a sliding seal between the piston and cylinder wall
• C、scrape oil off the cylinder wall as the piston moves down on the power an intake strokes.
• D、all of the above

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2、[主观题]【英译中】The suspension system can absorb the road shock,which results in a smoother ride,safer handling and less mechanical wear.

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3、[主观题]【英译中】The complete cycle of an engine requires four piston strokes:intake,compression,power and exhaust.

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4、[主观题]【英译中】Although the other three strokes are necessary,they are idle strokes.

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5、[主观题]【英译中】When the piston move to its highest position inside the cylinder,we can say it is at Top Dead Center(TDC).

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