During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）<br>A:effective cylinder scavenging and cooling<br>B:constant pressure from the turbochargers<br>C:cooler operation of the exhaust system<br>D:effective constant pressure for turbocharger operation

During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）
A:effective cylinder scavenging and cooling
B:constant pressure from the turbochargers
C:cooler operation of the exhaust system
D:effective constant pressure for turbocharger operation

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