what are the main duties of the third engineer ?请帮

正确答案：The third engineer is usually responsible for the following : 1) watch keeping from 0800 to 1200 ,and from 2000 to 2400 every day . 2) operation and maintenance of other auxiliary machinery except under the charge of the second engineer . 3) giving assistance to the first engineer in all technical matters . 4) taking positive measures in the safe and efficient operation of all machinery ,and guarding against fire and oil pollution . 5) safety produres and maintenance of all safety equipment ,and engine control system in a thoroughly efficient state . 6) carrying out instructions relating to ballasting and deballasting and recording the operation . 7) testing the telegragh before depature and recording all engine movement in the bell book for staying in the engine room when vessel is entering or leaving a port or when the engine is on standby or in maneuvering . 8) emergency fire pump and lifeboat engine .