【单选题】
Please tell the duty()(一水) to lower the gangway.
A、OS
B、AB
C、A or B
D、A+B
A、OS
B、AB
C、A or B
D、A+B
A、A.Pump diesel oil first B、B.300 tons of 180 cst fuel oil C、C.The figure is all right D、D.OK, I’ll sign it