【判断题】三聚氰胺是一种添加剂,但不是食品添加剂。
【判断题】当非手性的分子经反应得到的产物是手性分子,则必定是外消旋体。
【单选题】So confused _____ that he didn’t know how to start his lecture. A. since he became B. would he become C. that he became D. did he become
【判断题】三聚氰胺是一种添加剂,但不是食品添加剂。
【判断题】当非手性的分子经反应得到的产物是手性分子,则必定是外消旋体。
【简答题】心表面近心底处有一环形的沟为冠状沟,是____ _____与____________在心表面的分界标志。
【单选题】—_____ did he become a football player? —He became a football player in 1990. [ ]
【单选题】下列关于心表面的沟的描述中,说法错误的是( )