A.3 n mile
B.5 n mile
C.12 n mile
D.25 n mile
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A.30 liters per nautical mile
B.15 liters per nautical mile
C.30 ppm
D.15 ppm
A.30 liters per nautical mile
B.15 liters per nautical mile
C.30 ppm
D.15 ppm
A.50 nautical miles
B.30 nautical miles
C.15 nautical miles
D.12 nautical miles
A.about marine pollution prevention
B.covering marine protection of life
C.about marine
D.about ship and port security
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
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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