38. In order to maintain airtightness between the cylinder and the cylinder head, usually what parts to be fitted? (A) Seal gasket (B) Piston ring (C) O-ring (D) Rubber ring

1. When you are on duty-watch in the engine room, if any events encountered, what you will do on the engine logbook? (A) Not need write in the engine logbook. (B) To write in the engine logbook with signature in the logbook column headed with watch. (C) There are no necessary to write in, just remind to hand over engineer. (D) To choose most serious events recorded with signature in the logbook column.

38. In order to maintain airtightness between the cylinder and the cylinder head, usually what parts to be fitted?
(A) Seal gasket
(B) Piston ring
(C) O-ring
(D) Rubber ring

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