单选题Main propulsion engine lube oil sumps should be constructed （）Aso as to never be integral lubeBwith a sloped bottomConly of nonferrous, noncorrosive metalsDwith drain/return lines terminating just above or at the designed normal level
单选题
Main propulsion engine lube oil sumps should be constructed （）
A
so as to never be integral lube
B
with a sloped bottom
C
only of nonferrous, noncorrosive metals
D
with drain/return lines terminating just above or at the designed normal level
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