单项选择题

In an emergency，the electro-hydraulic steering units can be directly controlled by the（）.

A.trick wheel
B.rapson slide
C.follow-up gear
D.receiver unit

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单项选择题

In a Williamson turn，the rudder is put over full until the（）.

A.vessel has turned 90°From her original course
B.vessel has turned 60°From her original course
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If an emergency pump control is used as the emergency shutdown on a tank vessel，it must（）.

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D.None of the above