问题
选择题
She was standing by an electric heater and her nightdress _____ fire.
A．caught
B．set
C．took
D．had
答案
答案：A
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She was standing by an electric heater and her nightdress _____ fire.
A．caught
B．set
C．took
D．had
答案：A
=97.5%，
=0.2%，yC3H8=0.2%，
=1.6%，
=0.5%，当天然气的平均压力为3.04MPa，温度为5℃，压缩因子Z=0.94，则管道中的天然气在标准状态下（101325Pa、273.15K）的体积为（）m3。