乙醇含量在50%以下时适于提取()
A.内酯、香豆素类
B.生物碱、苷类
C.酯类、苷类
D.挥发油、树脂类、叶绿素
E.苦味质、蒽醌苷类
参考答案:E
The environmentalists and wild goats' _____ on the vast grasslands was a good indication of the better
environment. [ ]
A. escape
B. absence
C. attendance
D. appearance
用未加热的牛奶喂养婴儿可能导致()
A.先天性铁储存不足
B.铁丢失过多
C.生长发育慢
D.新生儿溶血
E.铁转运障碍