All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during （） for new piston rings.

时间：2019-04-14 10:16:40 关键词：their,on,external

All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during （） for new piston rings.

A.the running-in period

B.the running process

C.gas exchange process

D.the boiler firing

答案解析

A

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The cylinder contains a great weight of air and is capable of burning a great quantity of fuel at（）.
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The bore of each cylinder is formed in a liner which can be （） when worn out.
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All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during （） for new piston rings.
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