to reduce heat stress
to reduce low temperature corrosion
to improve firing and starting performance
fuel saving
第1题：
Your vessel has a midships engine room and the cargo is concentrated in the end holds．The vessel is ______．
A.sagging with tensile stress on main deck
B.sagging with compressive stress on main deck
C.hogging with tensile stress on main deck
D.hogging with compressive stress on main deck
第2题：
The main body of a vessel is the （）.
第3题：
What should be prepared before disassembly of cylinder for main engine or auxiliary engine?
第4题：
sagging with tensile stress on main deck
sagging with compressive stress on main deck
hogging with tensile stress on main deck
hogging with compressive stress on main deck
第5题：
control fuel injection time more precisely
control fuel injection rate more precisely
meet the environmental requirements
meet high engine speed requirements
第6题：
船舶的主体是船壳。（）
第7题：
The main body of a vessel is the hull.
The main body of a vessel is the superstructure.
The main body of a vessel is the engine room.
The main body of a vessel is the poop.
第8题：
When the ship, its main propulsion device equipped with clutch, arrived at the port and finished with the engine, the correct operation should be______.
A.disengaging the clutch firstly, then stopping the main engine
B.stopping the main engine firstly, then disengaging the clutch
C.stopping the cooling water pump firstly, then stopping the main engine
D.stopping the main engine and disengaging the clutch at the same time
第9题：
to inspect if the cylinder has the water leakage
to expel out the residual water/gas/oil from the cylinder
to check if fuel supply is normal
A and B
第10题：
tie rod
thrust block
bedplate of main engine
frame of main engine