今天看了一篇文章, 談論天然氣的...其中有些字句看不太懂, 因為是英文的...有那位化學達人可以幫忙一下..

"Gross Heating value of not less than 1.070 BTU's per standard cubic foot"

"Butanes(C4) and heavier, 2.00 mol%"

這兩句看不太懂...