單項(xiàng)選擇題

The number or name of a tank barge shall be（）.

A.displayed in at least 4 different positions on the barge
B.carved on a wooden board and attached to the barge's hull
C.displayed as close to the navigation lights as possible
D.displayed at the highest point of the barge's hull such that it can be seen from either side

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單項(xiàng)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

單項(xiàng)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

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The number or name of a tank barge shall be（）.

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

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

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