您要查找的是不是：
- Air consists chiefly of nitrogen. 空气主要由氮气组成。
- Nitrogen forms most of the Earth's air. 地球上空气的大部分成分是氮气。
- The lamp is full of gaseous nitrogen. 灯里充满了气体氮。
- Nitrogen forms about 78% of the earth's atmosphere. 氮约占地球大气的百分之七十八。
- It is helpful to begin with a rough and ready classification. 首先进行粗略的分类是很有帮助的。
- nitrogen classification 氮气分级
- There is a hierarchy in the classification of all living creatures. 一切生物均可按等级分类。
- Will you sunder nitrogen from air? 你能从空气中把氮气分离出来吗?
- Inverse agonist is a new type of classification. 摘要反向激动剂指一种新分类概念。
- One who assigns names, as in scientific classification. 命名者命名的人。如在科学分类中
- Nitrogen is the most commonly used gas. 氮气是最常用的气体。
- Sample gas tubes are flushed with nitrogen. 采气管得用氮气吹扫。
- The main reservoir of nitrogen is the atmosphere. 氮的主要蓄存库是大气层。
- These all belong in a different classification. 所有这些都属于不同的类别。
- What is the percentage of nitrogen in air? 空气中所含的氮的比例是多少?
- This kind of classification is not exhaustive. 这种分类法并不是包罗无遗的。
- Fast neutrons are also captured by nitrogen. 快中子也可以被氮吸收。
- I am studying spectral classification. 我在学习光谱分类。
- Nitrogen forms four-fifths of the atmosphere. 氮气占空气的五分之四。
- They defy accurate classification at present. 这使目前的正确分类有困难。
