Which of the following statements is correct regarding a turbocharged four-stroke/cycle diesel generator?（）

At zero load the intake manifold pressure is greater than the exhaust manifold pressure
B. At full load the intake manifold pressure and exhaust manifold pressure are equal
C. At full load the intake manifold pressure is less than the exhaust manifold pressure
D. At full load the intake manifold pressure is greater than the exhaust manifold pressure