当天然气甲烷含量大于95%时,天然气的绝热指数是多少?
参考答案:
天然气的绝热指数K=1.31。
I bargained with the shopkeeper for a long time, and finally we agreed________the price.
A.to
B.with
C.on
D.at
死亡的标准是心肺死亡。