[1-5]A野樱苷 B 氢氰酸 C 苦杏仁苷 D 苯羟乙腈 E 苯甲醛 属于下列结构类型的化合物为
苷元分解产物(与三硝基苯酚显色)
参考答案：E
世界上公认的第一台电子计算机诞生的年份是( )。
A．1943
B．1946
C．1950
D．1951
Yesterday afternoon I _____ a friend of mine most of time. [ ]
A. was visiting
B. was visited to
C. had visited
D. would has visit
