Corn stalk is composed of cellulose, hemicellulose and lignin.玉米秸秆主要由纤维素 、 半纤维素、木质素组成.Cellulose and hemicellulose could be used to produce fuel alcohol.纤维素、半纤维素可用来生产燃料酒精,而木质素往往被废弃.The corn stover mainly consists of cellu...
The price of the Saturday edition is going up with effect from 3 November.自11月3日起，周六版价格将上调。Saudi Arabia, in company with some other Gulf oil states, is concerned to avoid any repetition of the two oil price shocks of the...