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单选题
A vessel may be unable to take proper and effective action due to the speed（）too high or，in some circumstances，too low.
A
is
B
is to be
C
will be
D
being
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risk of collision existsB
the other vessel will cross ahead of herC
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单选题A stand-on vessel is（）.A
required to give way in a crossing situationB
required to sound the first passing signal in a meeting situationC
free to maneuver in any crossing or meeting situation as it has the right-of-wayD
required to maintain course and speed in a crossing situation but may take action to avoid collision
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单选题If you are the stand-on vessel in a crossing situation，you may take action to avoid collision by your maneuver alone. When may this action be taken?（）.A
At any time you feel it is appropriateB
Only when you have reached extremisC
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单选题You are in charge of a stand-on vessel in a crossing situation.The other vessel is 1.5 miles to port.You believe that risk of collision exists.You should（）.A
take avoiding action immediately upon determining that risk of collision existsB
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take avoiding action only after providing the give-way vessel time to take action ,and determining that her action is not appropriateD
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单选题Safe speed is defined as that speed where（）.A
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the vessel is not subject to vibrationsC
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单选题SAFE SPEED is defined as that speed where（）.A
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单选题When is a stand-on vessel FIRST allowed by the Rules to take action in order to avoid collision?（）A
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单选题Every vessel should at all times proceed at a safe speed. Safe speed is defined as that speed where（）.A
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单选题When shall the stand-on vessel in a crossing situation take action to avoid the other vessel（）.A
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单选题When a vessel navigates in an area with a small underkeel clearance but with adequate space to take avoiding action she（）.A
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decrease speedB
increase speedC
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turn to starboard for a vessel on her own port side
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