单选题According to the regulations，to prevent excessive pressure buildup in cargo tanks containing LFG，they are fitted with（）.Apressure vacuum relief valvesBexcess flow valvesCsafety relief valvesDflame screens
单选题
According to the regulations，to prevent excessive pressure buildup in cargo tanks containing LFG，they are fitted with（）.
A
pressure vacuum relief valves
B
excess flow valves
C
safety relief valves
D
flame screens
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