单选题In which of the scavenging methods listed will the exhaust valve be located in the cylinder head?（）AReturn-flowBUniflowCCross-flowDDirect flow
单选题
In which of the scavenging methods listed will the exhaust valve be located in the cylinder head?（）
A
Return-flow
B
Uniflow
C
Cross-flow
D
Direct flow
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