The film of oil between the rings and the liner is not only essential for the lubrication but also （） achieving a gas seal.<br>A:play a great part on<br>B:run a role in<br>C:plays an important part in<br>D:acts as important part at

The film of oil between the rings and the liner is not only essential for the lubrication but also （） achieving a gas seal.
A:play a great part on
B:run a role in
C:plays an important part in
D:acts as important part at

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