问题
选择题
Tom dropped in to see us on his way ________ home from the theater.
A.a
B.the
C.×
D.to
答案
答案:C
Tom dropped in to see us on his way ________ home from the theater.
A.a
B.the
C.×
D.to
答案:C
现有一瓶物质,为甲和乙的混合物,已知甲和乙的某些性质如下表,据此,将甲和乙分离的最佳方案是( )
物质 | 分子式 | 熔点 | 沸点 | 密度 | 可溶性 |
甲 | C3H6O2 | -98 ℃ | 57.5 ℃ | 0.93 | 溶于水 |
乙 | C4H8O2 | -84 ℃ | 77 ℃ | 0.91 | 溶于水 A.萃取法 B.升华法 C.分馏法 D.分液法 |