单选题Which statement is TRUE concerning protection of double bottom tanks against excessive pressure? （）AEach vent for the tank must be equal to the area of the tank filling lineBThe tanks must be protected by overflowsCThe total area of the vents or the overflow shall be at least equal to the area of the fill lineDThere must be twice as much vent area as the area of the fill line
单选题
Which statement is TRUE concerning protection of double bottom tanks against excessive pressure? （）
A
Each vent for the tank must be equal to the area of the tank filling line
B
The tanks must be protected by overflows
C
The total area of the vents or the overflow shall be at least equal to the area of the fill line
D
There must be twice as much vent area as the area of the fill line
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