阿摩線上測驗
6. The supplemented pressure acting on piston ring against the liner is
provided by ______ pressure over the inner circumference of the piston
rings to seal the cylinder when the piston reciprocates.
(A) gas
(B) scavenging air
(C) fuel
(D) lubricating oil
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統計： A(286), B(142), C(46), D(96), E(0) #1333492
統計： A(286), B(142), C(46), D(96), E(0) #1333492
