听力原文:W: The movie starts in 5 minutes and there's bound to be a long line. M: Why don't we come back for the next show? Q: What is the man suggesting? (6)
【单选题】The sequence of parts in a generally used fuel oil supply system for a main engine is _________.1tanks in the double bottom; 2 centrifuges;3 service tank; 4 settling tank; 5 viscosity regulator.