A molecule is a thousand times bigger than an atom of hydrogen .

一个分子比一个氢原子大一千倍。

属类：综合句库--

A chemist can isolate the oxygen from the hydrogen in water.

一个化学家能把水中的氧和氢分解。

属类：综合句库--

A chemist can isolate the oxygen from the hydrogen in water.

一个化学家能将水中的氧与氢分解。

属类：综合句库--

An acid having one replaceable hydrogen atom.

一元酸只有一个可置换氢原子的酸

属类：综合句库--

stress corrosion cracking and hydrogen embrittlement

应力腐蚀断裂和氢脆

属类：综合句库--

The decline in crude quality and changing refinery product markets is increasing the hydrogen requirements of oil refineries

原油质量下降，炼油产品市场变幻莫测，都使得炼油厂对氢气的需求不断增加。

属类：综合句库--

In proteins,atoms of nitrogen are combined with carbon, hydrogen and oxygen atoms.

在蛋自质中，氮原子与碳、氢、氧原子相化合。

属类：综合句库--

Fireclay and high-alumina refractories--Determination of titanium dioxide content--Hydrogen peroxide photometric method

粘土、高铝质耐火材料化学分析方法过氧化氢光度法测定二氧化钛量

属类：行业标准名称-国家标准名-GB/T6900.5-1986

This device is used to produce hydrogen .

这个装置是用来制取氢气的。

属类：综合句库--

calcium hydrogen orthophosphate[containing not less than 0.2% by weight of fluorine]

正磷酸氢钙[含氟重量不少于0.2%]

属类：物品名称-化工产品-