单选题Which of the following liquids can ordinarily be discharged overboard without being processed through an oily water separator?（）A Cargo tank ballastB Segregated ballastC Engine room bilgesD Cargo pump room bilges

The oil residues which cannot be discharged into the sea in compliance with MARPOL 73/78 shall be ______.

A.discharged to into special area

B.discharged into national waters

C.discharged into the designated zone

D.retained on board or discharged to reception facilities

Before starting any diesel or gasoline engine, which of the following must be checked?____.

A.Oil level

B.Flow of cooling water

C.Exhaust discharge

D.All of the above

A.It can be applied to separate two liquids

B.It cannot separate solids which contaminated in the oil.

C.It consists of purifier and clarifier

D.The centrifuge arranged to separate two liquids is known as purifier

Regulations require that cargo tanks in which grades B or C liquids are carried must be vented with which of the following ________．

A.Gooseneck vents

B.Flame screens

C.Pressure vacuum relief valves

D.Forced draft blowers

A.RSH

B.SNMP

C.FTP

D.TELNET