单项选择题
Large vessel leaving. Keep clear（）approach channel.
A.off
B.reach
C.from
D.of
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单项选择题
It is an（）condition precedent in every voyage charter-party that the ship shall proceed on the voyage without departure from her proper course.
A.implemented
B.implied
C.impossible
D.improper -
单项选择题
In stopping distances of vessels，head reach can best be described as the（）.
A.difference between the vessel's speed through the water at any instant and the new speed ordered on the telegraph
B.distance the vessel has actually run through the water since a change of speed was ordered
C.distance the vessel will run between taking action to stop her and being stationary in the water
D.speed at which a vessel should proceed to ensure that she will run a predetermined distance，once her engines have been stopped -
单项选择题
If you do NOT understand the course or intention of an approaching vessel you should sound （）.
A.one short blast
B.one prolonged blast
C.not less than five short blasts
D.not less than five prolonged blasts
