一个相对分子质量为84的单烯烃,有旋光性,其分子中有______个伯碳原子。
参考答案:2。
The declaration, issued by women foreign ministers attending the annual six-week session of the UN Human Rights Commission in Geneva, is focused on violence against women and appeals for sincere engagement for the protection and advancement of women.
急性粟粒型肺结核治疗方案中可选()
A.异烟肼、链霉素、卷曲霉素
B.异烟肼、卡那霉素、吡嗪酰胺
C.氨硫脲、乙胺丁醇、对氨水杨酸
D.利福平、异烟肼、丙硫异烟胺
E.异烟肼、链霉素、对氨水杨酸