单项选择题
A.the ventilation pipe B.the water line for fire fighting on the deck C.the fuel oil line D.the water supplying line in bath room
When sailing in cold zones, the（） should be heated.A.th...
单项选择题When sailing in cold zones, the（） should be heated.
A.the steering gear room B.the fire fighting pipe line C.the fuel oil tank D.the bath room
When the ships is going to enter into the harbor,（）.A.c...
单项选择题When the ships is going to enter into the harbor,（）.
A.change from diesel oil to heavy fuel oil for mail engine B.pump out bilge water C.change sea chest form lower level one to high level one D.test emergency generator
Most often （） is attached to the engine-propeller shaft...
单项选择题Most often （） is attached to the engine-propeller shaft for efficient electric power generation.
A.a variable-speed AC generator B.a fixed-speed AC generator C.an air blower D.a DC generator
