甲烷和丙烷是烷烃。Methane and propane are alkanes.丙烷气钢瓶a propane gas cylinder亚胺基杂环丙烷季铵盐的阳离子,一定是按协同反应的方式开环的.The aziridinium ions must all be opened by a concerted process....
我们已安排好去造访她位于帕西菲克格罗夫的家。We had made arrangements to stop by her house in Pacific Grove.一位市场调查人员造访了他的住处。A market researcher called at the house where he was living.每位游学旅行者都必得造访佛罗伦萨。Every traveller on the Grand Tour had to v...
There are many good automatic, semiautomatic, and hand feeding devices available commercially.市场上已有许多优良的自动 、 半自动和手工饲喂装置出售.Manual control or electric control of pressure , time , temperature or semiautomatic control.操作采用手...
The regimental headquarters ordered the second company to take the lead and the fourth company to bring up the rear.团部命令二连担任先头部队,四连殿后.You go ahead of us and we'll bring up the rear.你走我们前边,我们殿后.Malawi, Cameroon and W...