How should cargo tank hatches be protected when the ullage opening is open and the tank not gas free?（）.<br>A:With gooseneck vents<br>B:With warning signs<br>C:With flame screens<br>D:With pressure-vacuum relife valves

How should cargo tank hatches be protected when the ullage opening is open and the tank not gas free?（）.
A:With gooseneck vents
B:With warning signs
C:With flame screens
D:With pressure-vacuum relife valves

出自：海船船员证

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