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%.The method and the condition of separation epoxy ethane from dihydric alcohol are described.介...
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%.The cloud might be snowing ethane snowflakes into methane lakes below.云层可能正在向下面的甲烷湖飘落乙烷雪.BA 1...
He has spent periods in prison, where he was gruesomely tortured.他坐过几次牢，在牢里受到非人的折磨。The man was a sadist who tortured animals and people.那个男人是个施虐狂，喜欢虐待动物和人。He said that he was not tortured or maltreated during his detenti...
Allogamy Cross - fertilization in plants.异花受精:植物中的异体受精.Most plants are hermaphrodite, but have mechanisms such as self - INCOMPATIBILITY that promote allogamy.许多植物是雌雄同体的, 但它们存在自交不亲和的机制,从而促进异花受精....