A green pillar lightbuoy，Fl(2) 5s，is to be substituted for the red conical lightbuoy Close S.W．of the stranded wreck．The above sentence mainly refers to______．A.a red buoy is to be replaced by a green buoyB.a green buoy is to be replaced by a red buoyC.either a red buoy or a green buoy is to be replacedD.neither a red buy nor a green buoy is to be replaced
A green pillar lightbuoy，Fl(2) 5s，is to be substituted for the red conical lightbuoy Close S.W．of the stranded wreck．The above sentence mainly refers to______．
A.a red buoy is to be replaced by a green buoy
B.a green buoy is to be replaced by a red buoy
C.either a red buoy or a green buoy is to be replaced
D.neither a red buy nor a green buoy is to be replaced
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