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单选题
Each piston stuffing box is provided with two sealing rings and three（）
A
packings
B
piston rings
C
distributor rings
D
scraper rings
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单选题If due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port inspection)What condition of the piston rings can result in this phenomenon?（）A
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单选题The packing installed in the pump stuffing box is lubricated by （）.A
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crankshaft revolutionB
mechanical cycle of operationC
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