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 deck fitting, used to secure line or wire rope, consisting of a single body with two protruding horns is called a（）.

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A deepwell pump is a type of（）.

A.screw pump
B.centrifugal pump
C.eductor
D.gear pump