用金属锂 - 液氨一步还原法合成γ姜黄烯.实验证实γ姜黄烯极不稳定,室温下极易芳香化转变成α姜黄烯.The synthesis of ν - curcumene was described. The experiment affirmed that ν - curcumene can aromatize to α - curcumene readily at room temperature....
Gorals seldom feed on Pinus koraiensis, Picea jezoensis, Abies nephralepis ( 1 %, 0.7 % and 1.7 % , respectively ).斑羚在冬季食红松 、 云杉 、 冷杉较少 ( 1% 、 0.7%、1.7% ).The rotten degree of fir trees is an important sign of quality of...
Ghana does not have an unblemished record on human rights.加纳在人权方面并非毫无瑕疵。It has increased to such an extent that Ghana can now export maize.玉米产量增长得如此迅速，现在加纳已经可以出口玉米了。Ghana's main export is cocoa.加纳的主要出口商品是可可豆。...