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單項(xiàng)選擇題

A C0₂ portable extinguisher is annually checked by（）.

A.reading the gage pressure
B.weighing the extinguisher
C.discharging a small amount of CO₂
D.seeing if the seal has been broken

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單項(xiàng)選擇題

A contra-guide is a type of（）.

A.bow thruster
B.cargo gear
C.steering engine
D.rudder

單項(xiàng)選擇題

A dead reckoning (DR) plot（）.

A.must utilize magnatic courses
B.must take set and drift into account
C.should be replotted hourly
D.should be started each time the vessels position is fixed

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A C02 portable extinguisher is annually checked by（）.

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A contra-guide is a type of（）.

A dead reckoning (DR) plot（）.

A C0₂ portable extinguisher is annually checked by（）.