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单选题
The sludge tank installed in the diesel engine room is used to collect（） Ⅰ.sludge from the fuel oil settling tanks ad centrifuge Ⅱ.water that has been collected in the settling tank
A
Ⅰonly
B
Ⅱ only
C
bothⅠand Ⅱ
D
neitherⅠor Ⅱ
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单选题The sludge tank installed in the diesel engine room is used to collect（） Ⅰ.sludge from the fuel oil settling tanks ad centrifuge Ⅱ.water that has been collected in the settling tankA
ⅠonlyB
Ⅱ onlyC
bothⅠand ⅡD
neitherⅠor Ⅱ
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injection pump plungers stuck or wornB
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考题
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考题
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Pour point improversC
InhibitorsD
Foam suppressors
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cause blow-byB
chemically attack the piston skirtC
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单选题The double bottom in a vessel is a space comprised of （）A
plating forming the engine room tank topB
doubler plating installed over the flat keel plateC
a watertight boundary formed by the inner bottomD
compartments between the inner and outer bottoms
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