【单选题】When oil is being consumed by passing through the engine, it usually will cause heavy ______ to come from the exhaust, particularly after the engine has idled for several minutes.
【简答题】My steamboat voyage to Albany and back has turned out rather more favorable than I had expected. The distance form New York to Albany is 150 miles. I ran it up within 32 hours and down in 30. I had a ...