The distress message of a ship should include considerable information which might facilitate the rescue. This information should（）.

A.ALWAYS be included in the initial distress message

B.be sent to a MSA station FIRST

C.be transmitted as a series of short messages，if time allows

D.include the vessel's draft

当原料油馏份变重后，由于反应较难进行，（）要相应提高一些或（）适当降低，以维持一定精制深度。