难检字字典在线查询

汉语拼音：jiǎ wán

也称沼气”、坑气”。化学式ch4。无色无味易燃气体。极难溶于水。化学性质较稳定，跟强碱、强酸或强氧化剂一般不起反应。是天然气、沼气、坑气的主要成分。实验室中用无水醋酸钠和碱石灰混和加热而得，工业上由石油气分离而得。主要用作燃料，制乙炔、氢气、炭黑等。

• The ignition of methane gas killed eight men.

  甲烷起火，致使8人丧生。

• Methane and propane are alkanes.

  甲烷和丙烷是烷烃。

• Methane is often regarded as the second most important greenhouse gas after carbon dioxide.

  甲烷常被认为是仅次于二氧化碳的重要温室气体。

• A methane molecule is composed of one carbon atom attached to four hydrogens.

  甲烷分子由1个碳原子与4个氢原子构成。

• Most of the chlorofluoromethanes reside in the lower stratosphere.

  大多数氯氟甲烷存留在平流层下部.

• The chlorofluoromethanes are used principally in aerosol spray cans and as refrigerants.

  氯氟甲烷主要使用在气溶胶喷雾罐和作为冷冻剂.

• Compounds such as methane can be cleaved to carbon and hydrogen.

  象甲烷这样的化合物能分解为碳和氢.

• This is a generally known method for obtaining phenylnitromethane from benzyl cyanide.

  从苯乙腈制取苯基硝基甲烷就用这个方法.

• In liquid mixtures tetranitromethane may be used as an oxidizing agent.

  四硝基甲烷可用做液态混合物中的氧化剂.

• Methane may have extraterrestrial significance.

  甲烷具有星际意义.

• They were able to nitrate methane to nitromethane.

  他们能将甲烷硝化成硝基甲烷.

• Methane is said to be hydrophobic.

  甲烷被称为疏水的.

• The gas , which is sulphur - free , contains 89 - 99 % methane, up to 6 % ethane, and 3 % propane.

  天然气不含硫, 含甲烷88-99%, 乙烷6%和丙烷3%.

• One might expect azomethane to have a Y structure similar to that of acetone ( CH 3 ) 2 CO.

  可以预期偶氮甲烷分子具有和丙酮 ( CH3 ) 2CO分子相似的丫形结构.

• Coal - gas, obtained from the distillation of coal is mainly a mixture of hydrogen and methane.

  煤经蒸馏以后所得到的煤气主要是氢气和甲烷的混合物.