在一定条件下,能发生银镜反应,且与羟基丙醛互为同分异构体的是()。
A.丙醛
B.甲酸
C.甲酸乙酯
D.葡萄糖
E.果糖
参考答案:C
解析:
三个C,两个O。
Impressive ____, it fades next _____ the story of Armstrong's struggle against disease. [ ]
A. as is the record; by
B. as is the record; on
C. as the record is; for
D. as the record is; to
联系实际谈谈了解产品、技术生命周期的意义。