A direct-scavenged B uniflow-scavenged C loop-scavenged D cross-scavenged

Scavenging occurs as the incoming air sweeps out the exhaust gases, a process which is likely to be more effective in a/an _______, especially in cylinders of high stroke-to-bore ratios. 

A direct-scavenged 

B uniflow-scavenged 

C loop-scavenged 

D cross-scavenged

参考答案与解析：

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