利用达琴反应可以在醛、酮的羰基碳上引入一个新的羰基,而新的羰基碳原子则是由α-卤代酸酯提供。
A. 对
B. 错
丙二酸二乙酯可用于合成三至六元环烷羧酸。
A. 对
B. 错
书山有路勤为径,学海无涯苦做舟。There is no_______ to learning.____________ is the path to the moutain of knowledege, ____________ is the boat to the endless sea of learning.
世上无难事,只怕有心人。Nothing in the world is difficult for one who __________ to it.