单项选择题

Either a low injection pressure or a leakage of piston rings is able to lead （）.

A.a high exhaust temperature
B.a high smoky exhaust
C.a high output
D.a high compression

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单项选择题

Each piston stuffing box is provided with two sealing rings and three（）

A.packings
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单项选择题

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A.bridges
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