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.偶氮杂环丙烷是一类重要的 、 环内张力颇大的化合物.The diazirines are interesting , highly strained ring systems.在最佳反应条件下,环丙烷羧酸异丙酯的产率达92%.Under the opti...
Red ribbon forms a knot in the centre of the cogwheel.齿轮的中心交结着红绶.A cogwheel is placed where the wheat and rice stems cross at the base.齿轮安在下方麦稻杆的交叉点上....
We remove these rear controls and install them as canard controls.我们把尾部控制改为鸭式控制.This canard was started by William Herndon.这一谣言最初出自威廉·赫恩登之口.The charge that Harding was a political stooge may be a canard.关于哈丁是个政治走狗的指控可能是个...
This is a medical supplies company that produces disposable hypodermic syringes.这是一家生产多用途皮下注射器的药材公司.Is the move factor that inject uses intramuscular injection or hypodermic?注射用的转移因子是肌肉注射还是皮下注射?There is a risk of transmi...