单项选择题
A.cofferdams B.empty cargo spaces C.gas tight bulkheads D.areas equipped with power ventilation
Regulations require that tank vessels handling grade B ...
单项选择题Regulations require that tank vessels handling grade B liquids shall have their cargo pumps separated from all sources of vapor ignition by（）.
Regulations require that pumprooms on tank vessels carr...
单项选择题Regulations require that pumprooms on tank vessels carrying grade C liquid cargo with machinery spaces below the freeboard deck be ventilated with（）.
A.power ventilation B.gooseneck vents and flame screens C.at least two ducts extending to the weather deck D.a vent header system
Regulations require that cargo tanks carrying grades D ...
单项选择题Regulations require that cargo tanks carrying grades D or E liquids on tank barges be vented with（）.
A.gooseneck vents and flame screens B.pressure-vacuum relief valves C.branch vent lines and a vent header D.forced draft blowers
