According to Annex Ⅳ of comminuted and disinfected sewage using an approved system can be discharged when the ship is more than away from the nearest land（）

单项选择题According to Anneal I of MARPOL 73 78, the discharging oil content of the machinery space bilges must be lower than（）

A.30 liters per nautical mile
B.15 liters per nautical mile
C.30 ppm
D.15 ppm

单项选择题According to Annex I of MARPOL 73 78, the instantaneous discharging rate of the oily waste from cargo tanks of oil tankers must be lower than（）

A.30 liters per nautical mile
B.15 liters per nautical mile
C.30 ppm
D.15 ppm

单项选择题According to Annex I of MARPOL 73 78, oily waste from cargo tanks of oil tankers can be discharged when the ship is more than（）away from the nearest land.

A.50 nautical miles
B.30 nautical miles
C.15 nautical miles
D.12 nautical miles

单项选择题The MARPOL Convention is the main international convention（）

A.about marine pollution prevention
B.covering marine protection of life
C.about marine
D.about ship and port security

单项选择题At an unsheltered anchorage the chief engineer officer shall consult with the master whetheror not to maintain an underway watch“An underway watch” means（）

A.a watch which is kept with lower standard
B.a watch which is kept when the ship isnt sailing
C.a watch which is kept when the ship is sailing
D.a watch which is kept when the ship is in a restricted visibility area