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
Regulations require that cargo pumps in tankers carrying grade D liquid cargo shall be isolated from sources of vapor ignition by ______.
A. Cofferdams
B. Gastight bulkheads
C. Passageways or living quarters
D. General cargo spaces