航海英語(yǔ)液化氣體與IGC規(guī)則單項(xiàng)選擇題每日一練(2019.01.21)

來(lái)源：考試資料網(wǎng)

1 If you have a liquefied flammable gas barge in tow，which is NOT required of you with respect to the barge and its cargo? （）

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2 After the initial cleaning of flue gas in an inert gas system the gas is passed through what device for final cleaning?（）.

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3 Each ship having an inert gas system must have a portable instruments to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure（）.

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4 The weight of liquefied petroleum gas vapors as compared to air is（）.

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5 A vessel behaves as if all of its weight is acting downward through the center of gravity，and all its support is acting upward through the（）.

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