单项选择题 In rough weather，when a ship is able to maneuver，it is best to launch a lifeboat（）.

单项选择题 In painting a lifeboat following its overhaul，which parts must be painted bright red?（）

单项选择题 In order for combustion to occur inside a piping system such as a vapor collection header in a marine emmission control system，there must be（）.