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单选题
On a tank vessel, which of the following substances would be burning in a class "B" fire?（）
A
Oil
B
Wood
C
Rags
D
Electrical wiring
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单选题On a tank vessel, which of the following substances would be burning in a class "B" fire?（）A
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GMB
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the longitudinal center of gravityD
the stress on the hull
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单选题A vessel is equipped with cross-connected deep tanks.In which situation should the crossconnection valve be closed?（）.A
The tank lie above the waterline and are filledB
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The tanks are partially filled with liquid cargoD
The tanks are filled and lie below the waterline
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