单选题The primary hazard of liquefied petroleum gas and liquefied natural gas is（）.ApressureBtoxicityCtemperatureDflammability
单选题
The primary hazard of liquefied petroleum gas and liquefied natural gas is（）.
A
pressure
B
toxicity
C
temperature
D
flammability
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名词解释题液化天然气liquefied natural gas（LNG）