A shipboard Oil Pollution Emergency Plan is required of（）.

A.all vessels，regardless of size and commercial application

B.any barge or ship constructed or operated in such a manner that no oil in any form can be carried aboard

C.an oil tanker of 150 gross tons and above，or other ship of 400 gross tons and above

D.an oil tanker of 400 gross tons and above，or other ships of 150 gross tons and above

在46题中，R∩S为( )。

A．A

B．B

C．C

D．以上都是