单项选择题X 纠错

The main steering gear must be able to steer the ship at maximum ahead service speed and be capable at this speed, and at the ships deepest service draught, of putting the rudder from 35 degrees on one side to 30 degrees on the other side within no （）.

A.more than 28 seconds
B.more than 60 seconds
C.less than 28 seconds
D.less than 60 seconds

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Which of the following influences the position of the interface between the liquid seal and the oil in a purifier?（）

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