以非质子酸氯化亚锡为催化剂,催化合成了丁醛-1,2-丙二醇缩醛.Butyraldehyde 1,2 proparediol acetal was synthesized by using stannous chloride as catalyst.以非质子酸氯化亚锡为催化剂,催化合成了丁醛-1,2-丙二醇缩醛.Butyraldehyde 1,2 propanediol acetal was synthesized by using st...
...a family who could trace their ancestry back to the sixteenth century.世系可上溯到16世纪的家族The family has traced its ancestry to the Norman invaders.这个家族将自己的世系追溯到诺曼征服者.Their ancestry settled the land in 1856.他们的祖辈1856年在这块土地上定...
Thirty milch camels with colts , forty kine, and ten bulls, twenty she asses , and ten foals.哺乳的母骆驼三十匹,各带着驹子, 母牛四十头 、 牛十头 、 驴二十头 、 驴十头.This lark is going to turn into a milch cow.这个小百灵鸟快要变成有奶的牛了.I refuse to be a milch co...