28. 在液壓傳動系統中，洩壓閥的主要功能為何？ (A) 控制安全工作壓力 (B) 控制液流方向 (C) 調節運行速度 (D) 控制運行流量

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

28. 在液壓傳動系統中，洩壓閥的主要功能為何？
(A) 控制安全工作壓力
(B) 控制液流方向
(C) 調節運行速度
(D) 控制運行流量

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