21. Most dry-chemical fire extinguishers have a built-in _______.(A) temperature gauge(B) volume gauge(C) pressure gauge(D) vacuum gauge

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.

21. Most dry-chemical fire extinguishers have a built-in _______.
(A) temperature gauge
(B) volume gauge
(C) pressure gauge
(D) vacuum gauge

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