A、oil leakage in engine-room
B、hot work (welding, cutting, etc)
C、static electricity
D、all of the above
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A、The main cause was big power struggle for control of the world. B、It was the worldwide economic crisis. C、It was the military expansion of Japan,and Germany.
A、the solid impurities of large particle B、the solid impurities of fine particle C、the water content D、both water and solid impurities
A、the clearance of the main bearing B、the diameter of main bearing C、the gap of main beating D、the tolerance of main bearing
A、the clearance of the main bearing B、the diameter of main bearing C、the hardness of main bearing D、the tolerance of main bearing
A、the clearance of the main bearing B、the play of the miler bearing C、the gap of the main bearing D、the tolerance of the main bearing
A、The main body of a vessel is the hull. B、The main body of a vessel is the superstructure. C、The main body of a vessel is the engine room. D、The main body of a vessel is the poop.
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