单项选择题
There is a VHF set（）the front of the wheelhouse.
A.at B.on C.of D.in
单项选择题 Tide in this water area is（）in direction ENE.
单项选择题 To whom should the master render the Maritime Declaration of Health when the ship arrives at a port outside the territory?（）.
单项选择题 Upon arrival at the discharging port, the inert gas system is（）.
