甾醇是环戊烷全氢匪为骨架的一种物质，在自然界中以游离态和结合形式存在。
Sterol is a kind of substance of full cyclopentane hydrogen skeleton, and exists in the nature in free form and binding form.
结果表明，四氢呋喃是良好的共溶剂，游离脂肪酸含量高的废食用油有利于共溶体系的形成。
The results showed that tetrahydrofuran was a better cosolvent and the waste edible oils containing abundant free fatty acids was liable to form miscible system.
监测血清游离钙、枸橼酸、血钠、碳酸氢根浓度；
The serum ionized calcium, citrate, bicarbonate, sodium, serum creatinine and urea concentration.
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