Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.<br>A:during the valve overlap period<br>B:with only the exhaust valve open<br>C:at a pressure below atmospheric<br>D:without cooling the cylinders or pistons

Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.
A:during the valve overlap period
B:with only the exhaust valve open
C:at a pressure below atmospheric
D:without cooling the cylinders or pistons

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