B.
比空气重,lNm3丙烷重1.966kg。Heavier than air, lNm3 propane weighs 1.966kg.
C.
20℃及0.85MPa以上时呈液态。Liquid state at 20℃ and above 0.85MPa.
D.
丙烷的热值介于86403~93889kJ/m3。The caloric value of propane is between 86,403 and 93889kJ/m3.
E.
天然气中含量一般在0.005%~4%之间。Natural gas generally contains between 0.005% and 4%.