The crankcase of many diesel engines are kept under a slight vacuum by the （）.<br>A:scavenging action of the piston<br>B:piston type vacuum pump taking suction off a differential manometer<br>C:gland exhausting manometer<br>D:crankcase exhaust fan

The crankcase of many diesel engines are kept under a slight vacuum by the （）.
A:scavenging action of the piston
B:piston type vacuum pump taking suction off a differential manometer
C:gland exhausting manometer
D:crankcase exhaust fan

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