In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to（）.<br>A:produce a scavenging effect in the combustion space<br>B:equalize cylinder and exhaust manifold pressures<br>C:alleviate the difference in valve size between the intake and exhaust<br>D:flush out condensate that collects after each compression stroke

In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to（）.
A:produce a scavenging effect in the combustion space
B:equalize cylinder and exhaust manifold pressures
C:alleviate the difference in valve size between the intake and exhaust
D:flush out condensate that collects after each compression stroke

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