单项选择题

A lube oil sample taken from the main engine lube oil system has dark yellow opaque color.This is the result of （）

A.water contamination
B.mixing oils of two widely different viscosities
C.overheating
D.aeration

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When you are transferring fuel oil to the setting tanks, precautions to be observed should include （）

A.plugging gooseneck tank vents to prevent accident overflow
B.maintaining a high transfer rate until a slight trickle of oil is observed flowing from the overflow line
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A.for atomizing
B.for centrifuging
C.in a storage tank
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