Some research for setting up the measurement standard of oxygen and other gas volume flow meter for hospital are get.
为建立医用氧气及其他气体流量计的计量标准作了一些探索。
The transport cost per cubic meter of natural gas is gradually decreased in waveform with the rising of transportation volume per day, finally turns to a relatively stable value.
③每立方米天然气的运输费用随每天运输量的增加呈波形衰减状而逐渐降低，最后将趋近于一个相对稳定的值。
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