现有一瓶乙二醇和丙三醇的混合物,已知它们的性质如下表。据此,将乙二醇和丙三醇相互分离的最佳方法是
A.萃取法
B.结晶法
C.分液法
D.分馏法
答案:D
— Where was it _____ the road accident happened yesterday?
— In front of the market. [ ]
A. when
B. that
C. which
D. how
皮肤病患者最常见的症状是
A.疼痛
B.烧灼感
C.瘙痒
D.麻木
E.皮疹