单选题The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.Aupwards；inwardsBupwards；outwardsCdownwards；inwardsDdownwards；outwards
单选题
The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.
A
upwards；inwards
B
upwards；outwards
C
downwards；inwards
D
downwards；outwards
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