机体氧的运输主要通过
A.红细胞
B.白细胞
C.血红蛋白
D.血浆
E.血小板
参考答案:C
解析:机体内的血红蛋白是运输氧的主要工具。
----Where did you meet him?
----It was in the hotel ______ he stayed ______ I met him.
A.where, that
B.that, where
C.where, where
D.that, that
下列各化合物中,可以发生酯化、还原、加成、消去四种反应的是( )