A.there is a risk of collision B.you are the give-way vessel C.the other vessel is the give-way vessel D.there is no risk of collision
A.可調(diào)查性B.效益C.可見性D.可靠性
A.絕經(jīng)后出血B.陰道排液C.不規(guī)則陰道出血D.腹痛