單項(xiàng)選擇題Mainly east 3 or 4 partly cloudy to overcast occasional rain（）slowly south moderate or good.

A.spreading
B.proceeding
C.bounding for
D.going to


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1.單項(xiàng)選擇題Large vessel leaving. Keep clear（）approach channel.

A.off
B.reach
C.from
D.of

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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