In a general oil cooler circulated by sea water, the oil is at a higher pressure, the result being that any leak in the cooler will mean a loss of （）.

A.half the engine rotational speed
B.twice the engine rotational speed
C.the engine rotational speed
D.four times the engine rotational speed

A.increase its quality
B.obtain complete burning
C.reduce its weight
D.all of the above

A.a separator
B.oil
C.water
D.an oil collecting space