單項選擇題

The fresh air intake of the inert gas system（）.

A.prevents the flue gas from falling below 3% content of oxygen
B.allows the inert gas piping to be used for gas freeing the tanks
C.opens when there is excessive vacuum on the deck water seal
D.enables outside air to mix with and cool hot flue gasses

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單項選擇題

The designations A，B，C，D and E grades of cargo refer to the（）.

A.degrees of quality of petroleum products
B.flash point range and Reid vapor pressure index of petroleum products
C.grades of crude oil
D.pour point，color，and viscosity index of petroleum products

單項選擇題

The deck water seal of the inert gas system（）.

A.cools the inert gas and prevents soot from entering the cargo tanks
B.acts as an emergency shutdown when inlet pressures exceed the safe working pressure
C.prevents the backflow of hydrocarbon gasses into nonhazardous areas
D.relieves sudden large overpressures in the system

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The fresh air intake of the inert gas system（）.

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The designations A，B，C，D and E grades of cargo refer to the（）.

The deck water seal of the inert gas system（）.

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The designations A，B，C，D and E grades of cargo refer to the（）.