[单选题]The sequence of parts in a generally used fuel oil supply system for a main engine is （）(1)tanks in the double bottom(2)centrifuges(3)service tank(4)settling tank(5)viscosity regulator

正确答案 ：B

(1)-(4)-(2)-(3)-(5)

[单选题]Vents are led from the engine to head tank （） from the cooling water.

正确答案 ：A

for the release of air

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