您要查找的是不是：
- Keywords nitrogen profile;white layer;plasma denitriding; 浓度梯度;白亮层;辉光扩氮;
- The government is trying to keep a low profile on this issue. 政府力图在这个问题上保持低姿态。
- Air consists chiefly of nitrogen. 空气主要由氮气组成。
- In profile she is very like her mother. 由侧面看她很像她母亲。
- Nitrogen forms most of the Earth's air. 地球上空气的大部分成分是氮气。
- She sat observing his face in profile. 她坐着从侧面观察他的脸。
- The lamp is full of gaseous nitrogen. 灯里充满了气体氮。
- I turned my head and saw the profile of a man. 我转过头，看见了一个人的侧影。
- Nitrogen forms about 78% of the earth's atmosphere. 氮约占地球大气的百分之七十八。
- My boss asked me to write a profile for the new tennis champion. 我上司让我给这位新网球冠军写篇小传。
- The BBC are working on a profile of the British nuclear industry. 英国广播公司正在报道英国核工业概况。
- Keep a low profile until the trouble over your activities is past. 不到影响你活动的麻烦事过去，你不要抛头露面。
- The Queen's head appears in profile on British stamps. 英国邮票上有女王的侧面头像。
- Japan today simply stands too tall and too rich to maintain a low profile. 日本现在太醒目，太富裕了，很难再不引人注意了。
- Will you sunder nitrogen from air? 你能从空气中把氮气分离出来吗?
- 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。
- It also looks symmetrical in profile. 在横剖面上它看起来也是对称的。
- The main reservoir of nitrogen is the atmosphere. 氮的主要蓄存库是大气层。
- What is the percentage of nitrogen in air? 空气中所含的氮的比例是多少?
