单选题The weight of liquefied petroleum gas vapors as compared to air is（）.AvariableBthe sameClighterDheavier
单选题
The weight of liquefied petroleum gas vapors as compared to air is（）.
A
variable
B
the same
C
lighter
D
heavier
参考解析
解析：
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相关考题：
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名词解释题液化天然气liquefied natural gas（LNG）