4. ____________is the gas exchange process in which the charge air passes straight up through the length of the cylinder, forcing the exhaust gas through exhaust valve at the top of the cylinder.
(A) Loop flow scavenging
(B) Cross flow scavenging
(C) Uniflow scavenging
(D) Standard flow scavenging

4.___是一種氣體交換過程，在此過程中...