An instance member（） A: is also called a static member B: is always a variable C: is never a method D: belongs to a single instance， not to the class as a whole E: always represents an operatio

Do you require any further assistance ? My ship is safe now and no assistance is necessary.This VHF communication generally takes place during（）. A: salvage operation B: cargo discharging C: bunkering D: towing operatio

One of the differences between a two-stroke engine and a four-stroke engine is,（） A: a two-stroke engine works without exhaust operation B: a two-stroke engine works without compression stroke C: a two-stroke engine works without expansion stroke D: a two-stroke engine works without suction operatio