13. What shall be prevented from entering into the pressure indicator? (A) dust (B) energy (C) temperature (D) pressure

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

13. What shall be prevented from entering into the pressure indicator?
(A) dust
(B) energy
(C) temperature
(D) pressure

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