18. 小型船舶使用鐵梨木軸承的優點為不需潤滑系統，潤滑劑可直接以什麼介質替代？ (A) 海水 (B) 淡水 (C) 鐵梨木 (D) 柴油

8. One kind of tools which are in common use for daily maintenance works on the ship is a simple tool designed to insert and tighten, or to loosen and remove, screws. The tool comprises an approximately cylindrical handle to be held by the worker, and an axial shaft fixed to the handle, the tip of which is shaped to fit a particular type of screw. The handle and shaft allow the tool to apply torque. What tool is above description? (A) Hammer (B) Screwdriver (C) Pliers (D) Drill

18. 小型船舶使用鐵梨木軸承的優點為不需潤滑系統，潤滑劑可直接以什麼介質替代？
(A) 海水
(B) 淡水
(C) 鐵梨木
(D) 柴油

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