右图中的甲和乙都是正方形，BE＝6厘米，EF＝4厘米。 那么，阴影部分ABC的面积是多少平方厘米？（） A

A stand-on vessel is ______.

A.required to give way in a crossing situation

B.required to sound the first passing signal in a meeting situation

C.free to maneuver in any crossing or meeting situation as it has the right-of-way

D.required to maintain course and speed in a crossing situation but may take action to avoid collision

If your vessel is the stand-on vessel in a crossing situation ______.

A.you must keep your course and speed

B.you may change course and speed as the other vessel must keep clear

C.the other vessel must keep her course and speed

D.both vessels must keep their course and speed

Sailing vessels are stand-on over power-driven vessels except ______.

A.in a crossing situation

B.in a meeting situation

C.when they are the overtaking vessel

D.on the inland waters of the PR China

A.is holding course and speed

B.is turning to starboard

C.intends to pass port to port

D.will keep out of the way of the stand-on vessel

A.turning to port

B.turning to starboard

C.decreasing speed

D.increasing speed

A.When a risk of collision exists

B.When action by the give-way vessel alone will not prevent a collision

C.When the bearing to give-way vessel becomes steady

D.When the vessels become less than 1/2 mile apart

In which situation do the Rules require both vessels to change course ？______.

A.Two power-driven vessels meeting head-on

B.Two power-driven vessels crossing when it is apparent to the stand-on vessel that the give-way vessel is not taking appropriate action

C.Two sailing vessels crossing with the wind on the same side

D.All of the above

A.Cross ahead of the stand-on vessel

B.Make a large course change to starboard

C.Slow your vessel

D.Back your vessel

A.At any time you feel it is appropriate

B.Only when you have reached extremis

C.When you determine that your present course will cross ahead of the other vessel

D.When it becomes apparent to you that the give-way vessel is not taking appropriate action

A.Yours is the give-way vessel because it is less than 30 meters long

B.You shall not impede the safe passage of the tanker

C.The tanker is the stand-on vessel because it is to port of your vessel

D.The tanker is the stand-on vessel because it is the larger of the two vessels