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A marine chemist issues gas free certificates and is certified by which organization?
A.Mine Safety Appliance Association
B.American Chemical Society
C.Marine Chemists Association
D.National Fire Protection Association
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单选题A marine chemist issues gas free certificates and is certified by the（）.A
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American Chemical SocietyC
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National Fire Protection Association
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单选题A marine chemist issues gas free certificates and is certified by which organization? （）A
Mine Safety Appliance AssociationB
American Chemical SocietyC
Marine Chemists AssociationD
National Fire Protection Association
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the introduction of inert gas into a tank with the object of reducing the oxygen content to below 8% by volumeB
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the introduction of inert gas into a cargo tank during cargo discharge to replace the volume of discharged cargoD
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CCS marine surveyorB
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单选题Open ullage holes in tanks which are not gas-free must be protected by（）.A
PV valvesB
warning signsC
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单选题0pen ullage holes in tanks which are not gas-free must be protected by（）.A
PV valvesB
warning signsC
flame screensD
stop-check valves
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