油酸、癸酸、亚油酸属于较易挥发的有机酸。
参考答案:错
—Who's the little boy in the photo?
—It's me. The photo ______ eight years ago. [ ]
A. took
B. is taken
C. was taken
银量法测定水中的氯离子时,为什么要剧烈摇动锥形瓶?