您要查找的是不是：
- petroleum nitrogen bases 石油氮碱
- The nitrogen bases in DNA are adenine (A), guanine (G), thymine (T), and cytosine (C). 嘌呤一般包括腺嘌呤(adenine，A)和鸟嘌呤(guanine，G)2种，嘧啶有胸腺嘧啶(thymine，T)、胞嘧啶(cytosine，C)和尿嘧啶(uracil，U)3种。
- The nitrogen base controlled atmosphere continuous brazing furnace is the new brazing equipment. 文章介绍了现代用于冷轧不锈带钢生产的连续退火炉的组成及结构。
- Adenine A nitrogenous base (6-amino-purine)found in DNA and RNA. 腺嘌呤：在DNA和RNA中发现的含氮的碱基（6－氨基嘌呤）。
- A (Adenine): One of two purines that are used as nitrogenous bases . 腺嘌呤：作为含氮碱基的两种嘌呤中的一种。
- The application and constitution of nitrogen based atmosphere nitrocarburizing production line are intorduced. 介绍了氮基气氛在气体软氮化生产线上的应用和生产线的组成及作用。
- The sequence of nitrogenous Bases along a strand of DNA determines the genetic code. 去氧核糖核酸串上的氮基排序决定了遗传密码。
- Guanine A nitrogenous base found in DNA and RNA.Guanine has a pruine ring structure. 鸟嘌呤：是存在于DNA与RNA中的一种含氮碱基，具有一个嘌呤环结构。
- Air consists chiefly of nitrogen. 空气主要由氮气组成。
- Indonesia is abundant in petroleum deposits. 印尼的石油蕴藏量丰富。
- The co-condesation polymer of cyanurotriamide and nitrogenous base S with formaldehyde as the coupler and a capping agnt can be used as a good retanning agent. 以三聚氰胺及含氮碱S为基本原料,辅以适当的偶联剂与封端剂进行缩合共聚,缩聚产物可用作复鞣剂。
- A chemical derived from petroleum or natural gas. 石油化学制品从石油或天然气中提炼出的化学产品
- A trademark used for a brand of petroleum jelly. 凡士林用来作为石油脂的商标
- Nitrogen forms most of the Earth's air. 地球上空气的大部分成分是氮气。
- Taiwan seems to contain no petroleum. 台湾恐怕没有蕴藏石油吧！
- This land is rich with petroleum. 这片土地盛产石油。
- The lamp is full of gaseous nitrogen. 灯里充满了气体氮。
- We launched a bombing raid on enemy bases. 我们对敌方基地实施了突然袭击。
- The chemistry of petroleum and its derivatives. 石油化学石油及其复合物的化学
- Nitrogen forms about 78% of the earth's atmosphere. 氮约占地球大气的百分之七十八。
