20. 船上使用較多的一種船用泵，多用於燃油、滑油的循環、淨煉、以及駁送等管路系統上，此為何種泵? (A) 離心式泵 (B) 齒輪泵 (C) 往復式泵 (D) 噴射泵

) 5. Which situation do not need to stop engine for emergency in the following situations? (A) Moisture is separated from the lubricating oil. (B) An unusual sound has been made. (C) Heat has generated unusually from a part. (D) Smoke is issued from a bearing or any other moving part.