区别黄酮与二氢黄酮的显色反应是()
A.三氯化铝反应
B.盐酸—镁粉反应
C.四氢硼钠反应
D.锆盐—枸椽酸反应
E.三氯化锑
参考答案:C
---- I want to give this watch to David.
---- What ? Don’t you know it _________ Henry ?
A. belongs to
B. is belonged to
C. is belonging to
D.belonged to
运用手刮法如何刮削?