Whichofthefollowingstatementsrepresentsthefunctionofthecompressionringsinstalledatthetopofadieselenginepiston?
A、Controltheamountoflubeoilburnedinthecombustionchamber
B、Transmitheatfromthepistontothecylinderliner
C、Preventdamagetoringgrooveinsertsbyactionasaheatdam
D、Dissipatecombustionchambergaspressurebychannelingitthroughtheringgap